Your Query returns 5 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Mdr1bNM_01107510090mdr    Mdr1    Pgy1    Abcb1    Pgy-1    Abcb1b   
mdr1bAF03302510090
mdr1bAJ31241010116
mdr1bM5752410090
mdr1bL1654610116

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

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Text2Knowledge ... Yong Huang 2002