Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
hoxc9aNM_1315287955bz39    BZ-39    hoxc9   
hoxc9aAB0269708090
hoxc9aAF0712677955

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

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Text2Knowledge ... Yong Huang 2002