Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Abcb1bNM_01262310116Mdr1    Abcb1    Pgy1   
Abcb1bNM_01107510090mdr    Mdr1    Pgy1    Abcb1    Mdr1b    Pgy-1   
Abcb1bNT_08042910090

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

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Text2Knowledge ... Yong Huang 2002