Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
i204NM_0799697227i59    mAc    AconM    ACON-1    CG9244    l(2)07054    Acon   
i204NT_0337797227i59    mAc    AconM    ACON-1    CG9244    l(2)07054    Acon   

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

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Text2Knowledge ... Yong Huang 2002