Your Query returns 6 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
CsxNM_00870010090Nkx2.5    tinman    Nkx-2.5    Nkx2-5    600584
CSXBC0257119606NKX2.5    CSX1    NKX2E    NKX2-5    600584
CSXNM_0043879606CSX1    NKX2E    NKX2.5    NKX2-5    600584
CsxAF08313310090Nkx2-5    600584
CsxNW_04733410116
CsxNM_05365110116Nkx2-5    Nkx2.5   

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

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Text2Knowledge ... Yong Huang 2002