Your Query returns 6 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Nkx2-4NM_02350410090tinman    Nkx-2.4    1700001P03Rik   
NKX2-4AF2020379606
Nkx2-4NT_03921010090
Nkx2-4AF20203810090
Nkx2-4AF20203910090
Nkx2-4AF2810798355

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

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Text2Knowledge ... Yong Huang 2002