Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
mu-2NM_0791637227CG1960    mutator[2]    mu2   
mu-2NM_1679277227CG1960    mutator[2]    mu2   
mu-2NT_0374367227CG1960    mutator[2]    mu2   

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

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Text2Knowledge ... Yong Huang 2002