Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Nkx2.9NM_00870110090tinman    Nkx-2.9    Nkx2-9   
nkx2.9AF26753631033

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

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Text2Knowledge ... Yong Huang 2002