Your Query returns 4 Accession Numbers:
Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
HOX-2.6BC0492049606HOX2    HOX2F    HOXB4   
HOX-2.6NM_0240159606HOX2    HOX2F    HOXB4   
HOX-2.6NM_0240159606HOX2    HOX2F    HOXB4   
Hox-2.6NM_01045910090Hoxb4   

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

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Text2Knowledge ... Yong Huang 2002