Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Nkx2-1NM_00938510090T/EBP    Ttf-1    Nkx2.1    tinman    Nkx-2.1    Titf1   
Nkx2-1AF0778407739
Nkx2-1AF2810808355

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

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Text2Knowledge ... Yong Huang 2002