Your Query returns 11 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
hoxb9Y145297955
HOXB9AY3914307955
Hoxb9NM_00827010090Hox-2.5    142964
HOXB9AY4146789606142964
HOXB9AY4146799598
HOXB9AY41468010090142964
HOXB9NM_0240179606HOX2    HOX2E    HOX-2.5    142964
HoxB9S6685510095
Hoxb9NT_03952110090142964
HOXB9NT_0107839606142964
HOXB9BC0155659606HOX2    HOX2E    HOX-2.5    142964

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

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Text2Knowledge ... Yong Huang 2002