Your Query returns 4 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Nkx2-8Y119499031
NKX2-8BC0410909606NKX2.8    Nkx2-9    NKX2H   
NKX2-8NM_0143609606NKX2H    NKX2.8    Nkx2-9   
NKX2-8NT_0264379606

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

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Text2Knowledge ... Yong Huang 2002