Your Query returns 5 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
hoxb4aNM_1311157955Z-3    hoxb1    hoxb3a    hoxb5a    hoxb6a    hoxb7a    hoxb8a    hoxb1a   
hoxb4aNM_1311187955Z-17    zf13    ZF-13    hoxb4    HOX-B4   
hoxb4aAB0269568090
hoxb4aAF0712527955
hoxb4aAL6457827955

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

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Text2Knowledge ... Yong Huang 2002