Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
MGC63871BC0531237955Six6    zgc:63871   
MGC63871NM_2011057955Six6    zgc:63871   

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

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Text2Knowledge ... Yong Huang 2002