Your Query returns 22 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
HAT1NM_1352737227HAT    CG5229    dmHAG404    chm   
HAT1NT_0337797227HAT    CG5229    dmHAG404    chm   
hat1AE00500264091VNG0486G   
HAT1AF5278015691
hat1AJ4412523702
HAT1U333354932
HAT1AF0374423702
hat1AE00443764091VNG0486G   
Hat1NM_02611510090Hat-1    2410071B14Rik    603053
HAT1BC0186829606603053
HAT1BC0630039606603053
HAT1AY4021929606603053
HAT1AY4021939598
HAT1AY40219410090603053
HAT1NM_0036429606603053
Hat1NT_03920710090603053
Hat1BC05546010090603053
hat1NC_00260764091
HAT1AF2577399031
HAT1NT_0054039606603053
HAT1NM_2042079031
HAT1NC_0011484932

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

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Text2Knowledge ... Yong Huang 2002