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<link:definition>1027 - Disclosure - ACCOUNTS PAYABLE AND ACCRUED LIABILITIES (Tables)</link:definition>
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<link:definition>1028 - Disclosure - WARRANT LIABILITY (Tables)</link:definition>
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<link:definition>1046 - Disclosure - STOCKHOLDERS' EQUITY - Summary of number of price-reduced and price-retained warrants (Detail)</link:definition>
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<link:definition>1047 - Disclosure - STOCKHOLDERS' EQUITY - Conversion Option - Valuation Methodology (Detail)</link:definition>
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<link:definition>1048 - Disclosure - STOCKHOLDERS' EQUITY - Additional Information (Detail)</link:definition>
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<link:definition>1049 - Disclosure - WARRANTS - Share Purchase Warrants (Detail)</link:definition>
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<link:definition>1050 - Disclosure - WARRANTS - Weighted average summary of quantitative information (Detail)</link:definition>
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<link:usedOn>link:definitionLink</link:usedOn>
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<link:definition>1051 - Disclosure - WARRANTS - Summary of number of price-reduced and price-retained warrants (Detail)</link:definition>
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<link:definition>1052 - Disclosure - WARRANTS- Additional Information (Detail)</link:definition>
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<link:definition>1054 - Disclosure - STOCK OPTION PLANS - Weighted Average Assumptions (Detail)</link:definition>
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<link:definition>1055 - Disclosure - STOCK OPTION PLANS - Stock Based Compensation Expenses (Details)</link:definition>
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<link:definition>1056 - Disclosure - STOCK OPTION PLANS - Additional Information (Detail)</link:definition>
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<element name="SeriesDWarrantMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mrkr_SeriesDWarrantMember" substitutionGroup="xbrli:item" />
<element name="SeriesFWarrantMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mrkr_SeriesFWarrantMember" substitutionGroup="xbrli:item" />
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<element name="BCMMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="mrkr_BCMMember" substitutionGroup="xbrli:item" />
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</schema>
