Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
NKX2EBC0257119606NKX2.5    CSX1    CSX    NKX2-5    600584
NKX2ENM_0043879606CSX    CSX1    NKX2.5    NKX2-5    600584

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

Google

Text2Knowledge ... Yong Huang 2002