Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
six3.1BC0594147955fa01b08    wu:fa01b08    fc10a08    wu:fc10a08    six3a   
six3.1NM_1313627955six3    fa01b08    fc10a08    wu:fa01b08    wu:fc10a08    six3a   
Six3.1AF2769918355

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

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Text2Knowledge ... Yong Huang 2002