Your Query returns 8 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Six9NM_01138410090Optx2    Six6   
Six9BC0658319606OPTX2    SIX6   
SIX9AF1416519606SIX6   
Six9NM_0073749606OPTX2    SIX6   
Six9AJ0117869031
Six9AJ0117859606
Six9AJ01178710090
Six9AF1088207955

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

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Text2Knowledge ... Yong Huang 2002