Your Query returns 4 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
hox-2.1NM_1311017955ZF21    z-18    ZF-21    hoxb5    hox-B5    hoxb5a   
Hox-2.1NM_00826810090Hoxb5   
hox-2.1X682487955
HOX-2.1M867269606

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

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Text2Knowledge ... Yong Huang 2002