Your Query returns 11 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Optx2NM_01138410090Six9    Six6   
OPTX2BC0658319606Six9    SIX6   
OPTX2NM_0073749606Six9    SIX6   
OPTX2AB0413999606
OPTX2AB0414009598
OPTX2AB0414019593
OPTX2AB0414029600
OPTX2AF0316489606
Optx2AF05013010090
Optx2AF0501319031
OPTX2NM_2049949031

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

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Text2Knowledge ... Yong Huang 2002