Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
six3bBC0594257955SIX3    cb347    six3.2   
six3bNM_1313637955SIX3    six6    cb347    six3.2   

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

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Text2Knowledge ... Yong Huang 2002