Your Query returns 4 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
HDAC4aNC_0043547227HDAC    CG1770    GC1770    dHDAC4    dmHDA405    HDAC4   
HDAC4aNM_1326407227HDAC    CG1770    GC1770    dHDAC4    dmHDA405    HDAC4   
HDAC4aNM_1673567227HDAC    CG1770    GC1770    dHDAC4    dmHDA405    HDAC4   
HDAC4aAF5387137227

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

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Text2Knowledge ... Yong Huang 2002