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        <link:definition>101 - Document - Document And Entity Information</link:definition>

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        <link:definition>102 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS</link:definition>

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        <link:definition>103 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)</link:definition>

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        <link:definition>104 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS</link:definition>

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        <link:definition>105 - Statement - CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS&#39; EQUITY</link:definition>

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        <link:definition>106 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS</link:definition>

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        <link:definition>107 - Disclosure - NATURE OF OPERATIONS</link:definition>

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        <link:definition>108 - Disclosure - GOING CONCERN</link:definition>

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        <link:definition>109 - Disclosure - SUMMARY OF ACCOUNTING POLICIES</link:definition>

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        <link:usedOn>link:definitionLink</link:usedOn>

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        <link:definition>110 - Disclosure - PREPAID EXPENSES</link:definition>

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        <link:usedOn>link:definitionLink</link:usedOn>

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        <link:definition>111 - Disclosure - FURNITURE AND EQUIPMENT</link:definition>

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        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.atossagenetics.com/role/IntangibleAssets" id="IntangibleAssets">
        <link:definition>112 - Disclosure - INTANGIBLE ASSETS</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.atossagenetics.com/role/PayrollLiabilities" id="PayrollLiabilities">
        <link:definition>113 - Disclosure - PAYROLL LIABILITIES</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.atossagenetics.com/role/StockholdersEquity" id="StockholdersEquity">
        <link:definition>114 - Disclosure - STOCKHOLDERS&#39; EQUITY</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.atossagenetics.com/role/NetLossPerShare" id="NetLossPerShare">
        <link:definition>115 - Disclosure - NET LOSS PER SHARE</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>116 - Disclosure - CONCENTRATION OF CREDIT RISK</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>117 - Disclosure - COMMITMENTS AND CONTINGENCIES</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>118 - Disclosure - STOCK BASED COMPENSATION</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>119 - Disclosure - SUBSEQUENT EVENTS</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.atossagenetics.com/role/SummaryOfAccountingPoliciesPolicies" id="SummaryOfAccountingPoliciesPolicies">
        <link:definition>120 - Disclosure - SUMMARY OF ACCOUNTING POLICIES (Policies)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

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        <link:definition>121 - Disclosure - PREPAID EXPENSES (Tables)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>122 - Disclosure - FURNITURE AND EQUIPMENT (Tables)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.atossagenetics.com/role/IntangibleAssetsTables" id="IntangibleAssetsTables">
        <link:definition>123 - Disclosure - INTANGIBLE ASSETS (Tables)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.atossagenetics.com/role/PayrollLiabilitiesTables" id="PayrollLiabilitiesTables">
        <link:definition>124 - Disclosure - PAYROLL LIABILITIES (Tables)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.atossagenetics.com/role/StockholdersEquityTables" id="StockholdersEquityTables">
        <link:definition>125 - Disclosure - STOCKHOLDERS&#39; EQUITY (Tables)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>

      <link:roleType roleURI="http://www.atossagenetics.com/role/NetLossPerShareTables" id="NetLossPerShareTables">
        <link:definition>126 - Disclosure - NET LOSS PER SHARE (Tables)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.atossagenetics.com/role/CommitmentsAndContingenciesTables" id="CommitmentsAndContingenciesTables">
        <link:definition>127 - Disclosure - COMMITMENTS AND CONTINGENCIES (Tables)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>

      <link:roleType roleURI="http://www.atossagenetics.com/role/StockBasedCompensationTables" id="StockBasedCompensationTables">
        <link:definition>128 - Disclosure - STOCK BASED COMPENSATION (Tables)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.atossagenetics.com/role/NatureOfOperationsDetailsTextual" id="NatureOfOperationsDetailsTextual">
        <link:definition>129 - Disclosure - NATURE OF OPERATIONS (Details Textual)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.atossagenetics.com/role/PrepaidExpensesDetails" id="PrepaidExpensesDetails">
        <link:definition>130 - Disclosure - PREPAID EXPENSES (Details)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>

      <link:roleType roleURI="http://www.atossagenetics.com/role/FurnitureAndEquipmentDetails" id="FurnitureAndEquipmentDetails">
        <link:definition>131 - Disclosure - FURNITURE AND EQUIPMENT (Details)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>

      <link:roleType roleURI="http://www.atossagenetics.com/role/FurnitureAndEquipmentDetailsTextual" id="FurnitureAndEquipmentDetailsTextual">
        <link:definition>132 - Disclosure - FURNITURE AND EQUIPMENT (Details Textual)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.atossagenetics.com/role/IntangibleAssetsDetails" id="IntangibleAssetsDetails">
        <link:definition>133 - Disclosure - INTANGIBLE ASSETS (Details)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.atossagenetics.com/role/IntangibleAssetsDetails1" id="IntangibleAssetsDetails1">
        <link:definition>134 - Disclosure - INTANGIBLE ASSETS (Details 1)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.atossagenetics.com/role/IntangibleAssetsDetailsTextual" id="IntangibleAssetsDetailsTextual">
        <link:definition>135 - Disclosure - INTANGIBLE ASSETS (Details Textual)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.atossagenetics.com/role/PayrollLiabilitiesDetails" id="PayrollLiabilitiesDetails">
        <link:definition>136 - Disclosure - PAYROLL LIABILITIES (Details)</link:definition>

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        <link:usedOn>link:definitionLink</link:usedOn>

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      <link:roleType roleURI="http://www.atossagenetics.com/role/StockholdersEquityDetails" id="StockholdersEquityDetails">
        <link:definition>137 - Disclosure - STOCKHOLDERS&#39; EQUITY (Details)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.atossagenetics.com/role/StockholdersEquityDetails1" id="StockholdersEquityDetails1">
        <link:definition>138 - Disclosure - STOCKHOLDERS&#39; EQUITY (Details 1)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.atossagenetics.com/role/StockholdersEquityDetailsTextual" id="StockholdersEquityDetailsTextual">
        <link:definition>139 - Disclosure - STOCKHOLDERS&#39; EQUITY (Details Textual)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.atossagenetics.com/role/NetLossPerShareDetails" id="NetLossPerShareDetails">
        <link:definition>140 - Disclosure - NET LOSS PER SHARE (Details)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.atossagenetics.com/role/ConcentrationOfCreditRiskDetailsTextual" id="ConcentrationOfCreditRiskDetailsTextual">
        <link:definition>141 - Disclosure - CONCENTRATION OF CREDIT RISK (Details Textual)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.atossagenetics.com/role/CommitmentsAndContingenciesDetails" id="CommitmentsAndContingenciesDetails">
        <link:definition>142 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.atossagenetics.com/role/CommitmentsAndContingenciesDetailsTextual" id="CommitmentsAndContingenciesDetailsTextual">
        <link:definition>143 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details Textual)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.atossagenetics.com/role/StockBasedCompensationDetails" id="StockBasedCompensationDetails">
        <link:definition>144 - Disclosure - STOCK BASED COMPENSATION (Details)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.atossagenetics.com/role/StockBasedCompensationDetails1" id="StockBasedCompensationDetails1">
        <link:definition>145 - Disclosure - STOCK BASED COMPENSATION (Details 1)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.atossagenetics.com/role/StockBasedCompensationDetailsTextual" id="StockBasedCompensationDetailsTextual">
        <link:definition>146 - Disclosure - STOCK BASED COMPENSATION (Details Textual)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.atossagenetics.com/role/SubsequentEventsDetailsTextual" id="SubsequentEventsDetailsTextual">
        <link:definition>147 - Disclosure - SUBSEQUENT EVENTS (Details Textual)</link:definition>

        <link:usedOn>link:presentationLink</link:usedOn>

        <link:usedOn>link:definitionLink</link:usedOn>

        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:linkbaseRef xlink:type="simple" xlink:href="atos-20140630_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />

      <link:linkbaseRef xlink:type="simple" xlink:href="atos-20140630_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />

      <link:linkbaseRef xlink:type="simple" xlink:href="atos-20140630_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
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  <import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd" />

  <import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd" />

  <import namespace="http://fasb.org/us-types/2014-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2014/elts/us-types-2014-01-31.xsd" />

  <element name="PrepaidExpensesTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_PrepaidExpensesTextBlock" />

  <element name="SecuritiesPurchaseAgreementsAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem" id="atos_SecuritiesPurchaseAgreementsAxis" />

  <element name="SecuritiesPurchaseAgreementsDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_SecuritiesPurchaseAgreementsDomain" />

  <element name="InvestorPlacementAgent1AndPlacementAgent2WarrantsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_InvestorPlacementAgent1AndPlacementAgent2WarrantsMember" />

  <element name="AcueityWarrantsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_AcueityWarrantsMember" />

  <element name="Warrants2014AndPlacementAgentWarrantsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_Warrants2014AndPlacementAgentWarrantsMember" />

  <element name="LeaseAgreementPeriodAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem" id="atos_LeaseAgreementPeriodAxis" />

  <element name="LeaseAgreementPeriodDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_LeaseAgreementPeriodDomain" />

  <element name="LeaseAgreementDecember2011Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_LeaseAgreementDecember2011Member" />

  <element name="NameOfLessorAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem" id="atos_NameOfLessorAxis" />

  <element name="NameOfLessorDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_NameOfLessorDomain" />

  <element name="AreLlcMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_AreLlcMember" />

  <element name="NatureOfOperationsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="atos_NatureOfOperationsTable" />

  <element name="NatureOfOperationsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_NatureOfOperationsLineItems" />

  <element name="DeferredCostsCapitalizedPrepaidAndOtherAssetsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="atos_DeferredCostsCapitalizedPrepaidAndOtherAssetsTable" />

  <element name="DeferredCostsCapitalizedPrepaidAndOtherAssetsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_DeferredCostsCapitalizedPrepaidAndOtherAssetsLineItems" />

  <element name="CapitalizedNewProductDevelopmentCosts" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" xbrli:balance="debit" substitutionGroup="xbrli:item" id="atos_CapitalizedNewProductDevelopmentCosts" />

  <element name="AllowanceForLossOnImpairmentOfAssets" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" xbrli:balance="credit" substitutionGroup="xbrli:item" id="atos_AllowanceForLossOnImpairmentOfAssets" />

  <element name="LaboratorySoftwareMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_LaboratorySoftwareMember" />

  <element name="NewlyDevelopedWebsiteMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_NewlyDevelopedWebsiteMember" />

  <element name="CompanyWebsiteMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_CompanyWebsiteMember" />

  <element name="PayrollLiabilitiesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="atos_PayrollLiabilitiesTable" />

  <element name="PayrollLiabilitiesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_PayrollLiabilitiesLineItems" />

  <element name="ShareBasedPaymentAwardStockWarrantsValuationAssumptionsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="atos_ShareBasedPaymentAwardStockWarrantsValuationAssumptionsTable" />

  <element name="InvestorWarrants2014Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_InvestorWarrants2014Member" />

  <element name="PlacementAgentWarrantsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_PlacementAgentWarrantsMember" />

  <element name="ShareBasedPaymentAwardStockWarrantsValuationAssumptionsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_ShareBasedPaymentAwardStockWarrantsValuationAssumptionsLineItems" />

  <element name="StockholdersEquityTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="atos_StockholdersEquityTable" />

  <element name="EnsisheimPartnersLlcMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_EnsisheimPartnersLlcMember" />

  <element name="ManisteeVenturesLlcMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_ManisteeVenturesLlcMember" />

  <element name="FortyFourInvestorsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_FortyFourInvestorsMember" />

  <element name="ServicerMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_ServicerMember" />

  <element name="ShareholderMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_ShareholderMember" />

  <element name="WebsiteDevelopmentServicesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_WebsiteDevelopmentServicesMember" />

  <element name="ShareholdersOfAcueityMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_ShareholdersOfAcueityMember" />

  <element name="DrTimHunkapillerMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_DrTimHunkapillerMember" />

  <element name="EmployeesAndOfficersMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_EmployeesAndOfficersMember" />

  <element name="NonEmployeeDirectorsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_NonEmployeeDirectorsMember" />

  <element name="AspireCapitalFundLlcMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_AspireCapitalFundLlcMember" />

  <element name="VendorsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_VendorsMember" />

  <element name="MemberOfBoardOfDirectorsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_MemberOfBoardOfDirectorsMember" />

  <element name="VariousEmployeesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_VariousEmployeesMember" />

  <element name="PlacementAgentMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_PlacementAgentMember" />

  <element name="StockSplitAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem" id="atos_StockSplitAxis" />

  <element name="StockSplitDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_StockSplitDomain" />

  <element name="PriorToReverseShareSplitMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_PriorToReverseShareSplitMember" />

  <element name="SecuritiesPurchaseAgreementsInvestorMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_SecuritiesPurchaseAgreementsInvestorMember" />

  <element name="SecuritiesPurchaseAgreementsInvestorWarrantsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_SecuritiesPurchaseAgreementsInvestorWarrantsMember" />

  <element name="PlacementAgentAdditionalWarrantsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_PlacementAgentAdditionalWarrantsMember" />

  <element name="PlacementAgent1Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_PlacementAgent1Member" />

  <element name="PlacementAgent2Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_PlacementAgent2Member" />

  <element name="PrivatePlacementToAccreditedInvestorsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_PrivatePlacementToAccreditedInvestorsMember" />

  <element name="InvestorWarrantsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_InvestorWarrantsMember" />

  <element name="StockOptionAndIncentivePlan2010Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_StockOptionAndIncentivePlan2010Member" />

  <element name="TwoThousandAndFourteenPublicOfferingMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_TwoThousandAndFourteenPublicOfferingMember" />

  <element name="TwoThousandAndElevenPrivatePlacementMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_TwoThousandAndElevenPrivatePlacementMember" />

  <element name="TwoThousandAndThirteenPublicOfferingMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_TwoThousandAndThirteenPublicOfferingMember" />

  <element name="AcuietyWarrantsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_AcuietyWarrantsMember" />

  <element name="OutsideConsultingFirmMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_OutsideConsultingFirmMember" />

  <element name="NonQualifiedUnder2010StockOptionPlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_NonQualifiedUnder2010StockOptionPlanMember" />

  <element name="IncentiveStockOptionsUnder2010PlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_IncentiveStockOptionsUnder2010PlanMember" />

  <element name="StockOptionsUnder2010PlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_StockOptionsUnder2010PlanMember" />

  <element name="InducementStockOptions2010PlansMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_InducementStockOptions2010PlansMember" />

  <element name="EmployeesUnder2010StockOptionPlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_EmployeesUnder2010StockOptionPlanMember" />

  <element name="TotalSharesAuthorized" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="atos_TotalSharesAuthorized" />

  <element name="CashFeeEqualsToPercentageOfGrossProceedsFromSaleOfCommonStockAndWarrants" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_CashFeeEqualsToPercentageOfGrossProceedsFromSaleOfCommonStockAndWarrants" />

  <element name="ExercisePriceOfCommonStock" type="num:perShareItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="atos_ExercisePriceOfCommonStock" />

  <element name="FairValueOfWarrants" type="num:perShareItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="atos_FairValueOfWarrants" />

  <element name="InitialFairValueOfWarrants" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" xbrli:balance="credit" substitutionGroup="xbrli:item" id="atos_InitialFairValueOfWarrants" />

  <element name="WarrantsCallablePerShare" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_WarrantsCallablePerShare" />

  <element name="CommitmentsAndContingenciesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="atos_CommitmentsAndContingenciesTable" />

  <element name="LeaseAgreement2010Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_LeaseAgreement2010Member" />

  <element name="LeaseAgreementMarch2011Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_LeaseAgreementMarch2011Member" />

  <element name="LeaseAgreementJuly2011Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_LeaseAgreementJuly2011Member" />

  <element name="LeaseAgreementSeptember2011Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_LeaseAgreementSeptember2011Member" />

  <element name="LeaseAgreementMarch2014Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_LeaseAgreementMarch2014Member" />

  <element name="ComplegenIncMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_ComplegenIncMember" />

  <element name="SandersPropertiesLlcMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_SandersPropertiesLlcMember" />

  <element name="FredHutchinsonResearchCenterMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_FredHutchinsonResearchCenterMember" />

  <element name="RobertKellyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_RobertKellyMember" />

  <element name="MonthlyRentAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem" id="atos_MonthlyRentAxis" />

  <element name="MonthlyRentDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_MonthlyRentDomain" />

  <element name="MonthlyRentForPeriodFromFebruary242012ToAugust312012Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_MonthlyRentForPeriodFromFebruary242012ToAugust312012Member" />

  <element name="MonthlyRentForPeriodFromSeptember12012ToAugust312013Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_MonthlyRentForPeriodFromSeptember12012ToAugust312013Member" />

  <element name="MonthlyRentForPeriodFromSeptember12013ToNovember292014Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_MonthlyRentForPeriodFromSeptember12013ToNovember292014Member" />

  <element name="MonthlyRentFromDecember2014ThroughNovember2015Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_MonthlyRentFromDecember2014ThroughNovember2015Member" />

  <element name="MonthlyRentFromDecember2015ThroughNovember2016Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_MonthlyRentFromDecember2015ThroughNovember2016Member" />

  <element name="AffymetrixInMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_AffymetrixInMember" />

  <element name="LeaseAgreementAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem" id="atos_LeaseAgreementAxis" />

  <element name="LeaseAgreementDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_LeaseAgreementDomain" />

  <element name="OwnerchipProgramAgreementMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_OwnerchipProgramAgreementMember" />

  <element name="A5GeneticsKftMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_A5GeneticsKftMember" />

  <element name="CommitmentsAndContingenciesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_CommitmentsAndContingenciesLineItems" />

  <element name="AgreedToForfeit" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" xbrli:balance="debit" substitutionGroup="xbrli:item" id="atos_AgreedToForfeit" />

  <element name="RecallExpensesActual" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" xbrli:balance="debit" substitutionGroup="xbrli:item" id="atos_RecallExpensesActual" />

  <element name="AdditionalLicenseFeeAmountPaid" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" xbrli:balance="debit" substitutionGroup="xbrli:item" id="atos_AdditionalLicenseFeeAmountPaid" />

  <element name="AdditionalLicenseFeeObligationToPayForFutureMilestones" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" xbrli:balance="credit" substitutionGroup="xbrli:item" id="atos_AdditionalLicenseFeeObligationToPayForFutureMilestones" />

  <element name="ShareBasedPaymentAwardStockOptionsValuationAssumptionTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="atos_ShareBasedPaymentAwardStockOptionsValuationAssumptionTable" />

  <element name="DrHunkapillerMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_DrHunkapillerMember" />

  <element name="EmployeesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_EmployeesMember" />

  <element name="OfficersMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_OfficersMember" />

  <element name="DirectorsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_DirectorsMember" />

  <element name="ChiefExecutiveOfficerAndChiefScientificOfficerMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_ChiefExecutiveOfficerAndChiefScientificOfficerMember" />

  <element name="StockOptionOneMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_StockOptionOneMember" />

  <element name="StockOptionTwoMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_StockOptionTwoMember" />

  <element name="StockOptionThreeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_StockOptionThreeMember" />

  <element name="ShareBasedPaymentAwardStockOptionsValuationAssumptionLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_ShareBasedPaymentAwardStockOptionsValuationAssumptionLineItems" />

  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantDate" type="xbrli:dateItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantDate" />

  <element name="RelatedPartyTransactionDateRangeStart" type="xbrli:dateItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_RelatedPartyTransactionDateRangeStart" />

  <element name="RelatedPartyTransactionDateRangeEnd" type="xbrli:dateItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_RelatedPartyTransactionDateRangeEnd" />

  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate" />

  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageFairValue" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageFairValue" />

  <element name="ShareBasedCompensationStockOptionsActivityTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="atos_ShareBasedCompensationStockOptionsActivityTable" />

  <element name="ShareBasedCompensationStockOptionsActivityLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_ShareBasedCompensationStockOptionsActivityLineItems" />

  <element name="StockIssuedDuringPeriodSharesStockOptionsExercised1" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_StockIssuedDuringPeriodSharesStockOptionsExercised1" />

  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeitedInPeriodTotalIntrinsicValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" xbrli:balance="debit" substitutionGroup="xbrli:item" id="atos_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeitedInPeriodTotalIntrinsicValue" />

  <element name="StockbasedCompensationTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="atos_StockbasedCompensationTable" />

  <element name="BoardOfDirectorsChairmanAndChiefExecutiveOfficeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_BoardOfDirectorsChairmanAndChiefExecutiveOfficeMember" />

  <element name="FormerPresidentMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_FormerPresidentMember" />

  <element name="ChiefScientificOfficerMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_ChiefScientificOfficerMember" />

  <element name="ChiefExecutiveOfficerAndChiefTechnologyOfficerMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_ChiefExecutiveOfficerAndChiefTechnologyOfficerMember" />

  <element name="PromissoryNoteOneMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_PromissoryNoteOneMember" />

  <element name="PromissoryNoteTwoMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_PromissoryNoteTwoMember" />

  <element name="RobertLKellyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_RobertLKellyMember" />

  <element name="ReverseStockSplitAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem" id="atos_ReverseStockSplitAxis" />

  <element name="ReverseStockSplitDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_ReverseStockSplitDomain" />

  <element name="PriorToReverseStockSplitMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_PriorToReverseStockSplitMember" />

  <element name="NonQualifiedStockOptionsWereGrantedUnder2010PlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_NonQualifiedStockOptionsWereGrantedUnder2010PlanMember" />

  <element name="StockOptionsWereGrantedOutsideOf2010PlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_StockOptionsWereGrantedOutsideOf2010PlanMember" />

  <element name="StockbasedCompensationLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_StockbasedCompensationLineItems" />

  <element name="PeriodTypeAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem" id="atos_PeriodTypeAxis" />

  <element name="PeriodTypeDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_PeriodTypeDomain" />

  <element name="FromApril12013ThroughDateOfThisReportMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_FromApril12013ThroughDateOfThisReportMember" />

  <element name="April302013Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_April302013Member" />

  <element name="MillenniumMedicalDevicesLlcMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_MillenniumMedicalDevicesLlcMember" />

  <element name="IncreaseDecreaseInDeferredRent" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" xbrli:balance="debit" substitutionGroup="xbrli:item" id="atos_IncreaseDecreaseInDeferredRent" />

  <element name="ProceedsFromIssuanceOfCommonStockAndWarrants" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" xbrli:balance="debit" substitutionGroup="xbrli:item" id="atos_ProceedsFromIssuanceOfCommonStockAndWarrants" />

  <element name="NonCashReclassificationOfFurnitureAndEquipmentToPrepaidExpenses" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" xbrli:balance="debit" substitutionGroup="xbrli:item" id="atos_NonCashReclassificationOfFurnitureAndEquipmentToPrepaidExpenses" />

  <element name="CommonStockIssuedForCommitmentFeeInStockPurchaseAgreement" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" xbrli:balance="credit" substitutionGroup="xbrli:item" id="atos_CommonStockIssuedForCommitmentFeeInStockPurchaseAgreement" />

  <element name="GoingConcernDisclosureAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_GoingConcernDisclosureAbstract" />

  <element name="GoingConcernDisclosureTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_GoingConcernDisclosureTextBlock" />

  <element name="DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_DocumentAndEntityInformationAbstract" />

  <element name="PlacementAgentFeeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_PlacementAgentFeeMember" />

  <element name="StockholdersEquityLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_StockholdersEquityLineItems" />

  <element name="ExecutivesAndOfficersMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_ExecutivesAndOfficersMember" />

  <element name="DirectorsCompensationPaid" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" xbrli:balance="debit" substitutionGroup="xbrli:item" id="atos_DirectorsCompensationPaid" />

  <element name="SeniorOfficersMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_SeniorOfficersMember" />

  <element name="PercentageOfSharesSoldInOffering" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_PercentageOfSharesSoldInOffering" />

  <element name="PercentageOfCommonStockOutstanding" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="atos_PercentageOfCommonStockOutstanding" />

  <element name="EntitledToReceiveWorthOfCommonStock" type="num:perShareItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="atos_EntitledToReceiveWorthOfCommonStock" />

  <element name="FinancingFeeFromPublicOfferig" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" xbrli:balance="credit" substitutionGroup="xbrli:item" id="atos_FinancingFeeFromPublicOfferig" />

  <element name="StockIssuedDuringPeriodValueWarrantsExercised" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" xbrli:balance="credit" substitutionGroup="xbrli:item" id="atos_StockIssuedDuringPeriodValueWarrantsExercised" />

  <element name="StockIssuedDuringPeriodSharesWarrantsExercise" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_StockIssuedDuringPeriodSharesWarrantsExercise" />

  <element name="WarrantsIssuedDuringPeriodAcquisitions" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_WarrantsIssuedDuringPeriodAcquisitions" />

  <element name="WarrantPrice" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="atos_WarrantPrice" />

  <element name="MonthlyLeaseRent" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" xbrli:balance="debit" substitutionGroup="xbrli:item" id="atos_MonthlyLeaseRent" />
</schema>



