Your Query returns 18 Accession Numbers:
Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Hoxa9NM_01045610090D6a9    Hox-1.7    142956
HOXA9BC0065379606HOX1G    MGC1934    HOX1.7    ABD-B    142956
HOXA9BC0100239606HOX1G    MGC1934    HOX1.7    ABD-B    142956
HOXA9U418139606142956
HOXA9AY4183809606142956
HOXA9AY4183819598
HOXA9AY41838210090142956
HOXA9NM_1527399606ABD-B    HOX1G    HOX1.7    MGC1934    142956
HOXA9NM_0021429606ABD-B    HOX1G    HOX1.7    MGC1934    142956
Hoxa9NT_03934310090142956
Hoxa9BC05505910090D6a9    142956
hoxA9AB0304648090
hoxA9AB0304658090
Hoxa9AF08974334816
HoxA9AF2242627792
hoxa9AJ3197498355
HOXA9NT_0078199606142956
HOXA9NT_0795929606142956

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

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Text2Knowledge ... Yong Huang 2002