Your Query returns 5 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
MXR1NM_01192010090MXR    ABCP    BCRP    ABC15    Bcrp1    Abcg2   
MXR1BC0212819606BCRP    ABCP    ABC15    MXR    EST157481    BCRP1    BMDP    MRX    ABCG2   
MXR1NM_0048279606MRX    MXR    ABCP    BCRP    BMDP    ABC15    BCRP1    EST157481    ABCG2   
MXR1BC05373010090MXR    ABCP    BCRP    ABC15    Bcrp1    Abcg2   
MXR1NC_0011374932MSRA   

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

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Text2Knowledge ... Yong Huang 2002