Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
AA-NAT1NM_0791157227Dat1    NAT1    aaNAT    Aanat1    CG3318    Dat   
AA-NAT1NM_2062127227Dat1    NAT1    aaNAT    Aanat1    CG3318    Dat   
AA-NAT1NT_0337787227Dat1    NAT1    aaNAT    Aanat1    CG3318    Dat   

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

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Text2Knowledge ... Yong Huang 2002