Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
fa01b08BC0594147955six3.1    wu:fa01b08    fc10a08    wu:fc10a08    six3a   
fa01b08NM_1313627955six3    six3.1    fc10a08    wu:fa01b08    wu:fc10a08    six3a   

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

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Text2Knowledge ... Yong Huang 2002