Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
MGC39850BC0280069606AILIM    ICOS   
MGC39850BC0282109606AILIM    ICOS   
MGC39850NM_0120929606AILIM    ICOS   

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* OMIM link based on symbol match for human and mouse.

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Text2Knowledge ... Yong Huang 2002