Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
zgc:73392BC0596967955MGC73392    hdac9   
zgc:73392NM_2008167955MGC73392    hdac9   

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

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Text2Knowledge ... Yong Huang 2002