Your Query returns 10 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Mdr1aNM_01107610090Pgp    MDR3    P-gp    Pgy3    Abcb4    Pgy-3    mdr-3    Abcb1a   
Mdr1aNM_13340110116Abcb1a   
mdr1aM3358110090
mdr1aM3358010090
mdr1aS6661810118
mdr1aAH01097710090
mdr1aAF03302210090
mdr1aAF03302310090
mdr1aAF03302410090
Mdr1aAF28616710116

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

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Text2Knowledge ... Yong Huang 2002