Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Abcb1aNM_01107610090Pgp    MDR3    P-gp    Pgy3    Abcb4    Mdr1a    Pgy-3    mdr-3   
Abcb1aNT_08042910090
Abcb1aNM_13340110116Mdr1a   

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

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Text2Knowledge ... Yong Huang 2002