Your Query returns 9 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Aanat1NM_0791157227Dat1    NAT1    aaNAT    CG3318    AA-NAT1    Dat   
Aanat1NM_2062127227Dat1    NAT1    aaNAT    CG3318    AA-NAT1    Dat   
Aanat1NT_0337787227Dat1    NAT1    aaNAT    CG3318    AA-NAT1    Dat   
AANAT1AY3162968355AANAT1a1   
AANAT1AY3162978355AANAT1a2   
aanat1AY3491587955
AANAT1AF0340818010
AANAT1AF0340848010
Aanat1AE0034637227

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

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Text2Knowledge ... Yong Huang 2002