Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
GSTM1b-1bBC0240059606GST1    GSTM1-1    GSTM1a-1a    GTH4    GTM1    MU-1    MGC26563    MU    H-B    GSTM1   
GSTM1b-1bNM_0005619606MU    H-B    GST1    GTH4    GTM1    MU-1    GSTM1-1    MGC26563    GSTM1a-1a    GSTM1   
GSTM1b-1bNM_1464219606MU    H-B    GST1    GTH4    GTM1    MU-1    GSTM1-1    MGC26563    GSTM1a-1a    GSTM1   

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

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Text2Knowledge ... Yong Huang 2002