Your Query returns 4 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
CSX1BC0257119606NKX2.5    CSX    NKX2E    NKX2-5   
CSX1NM_0043879606CSX    NKX2E    NKX2.5    NKX2-5   
csx1Z992924896SPAC17A2.09c   
csx1NC_0034244896SPAC17A2.09c   

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

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Text2Knowledge ... Yong Huang 2002