Your Query returns 27 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Mrp1NM_00857610090MRP    Mdrap    Abcc1a    Abcc1b    Abcc1    158343
MRP1NM_0049969606MRP    ABCC    GS-X    ABC29    ABCC1    158343
MRP1NM_0198999606MRP    ABCC    GS-X    ABC29    ABCC1    158343
MRP1NM_0199009606MRP    ABCC    GS-X    ABC29    ABCC1    158343
MRP1NM_0199019606MRP    ABCC    GS-X    ABC29    ABCC1    158343
MRP1NM_0199029606MRP    ABCC    GS-X    ABC29    ABCC1    158343
MRP1NM_0198989606MRP    ABCC    GS-X    ABC29    ABCC1    158343
MRP1NM_0198629606MRP    ABCC    GS-X    ABC29    ABCC1    158343
mrp1AJ3440448260
MRP1U510324932
MRP1AF0440313702
MRP1AB0821249913
MRP1AF4032419615
MRP1AF4032469823
MRP1AY3637289615
mrp1AJ3185184577
mrp1AJ3185194577
mrp1AJ53521539947
MRP1AF4425573055
MRP1AY1862444577
MRP1AY1862454577
MRP1AY1466729541
MRP1AY1466739541
MRP1AJ0031989606158343
MRP1AJ27788110116
Mrp1AY17091610116
MRP1NC_0011364932

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

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Text2Knowledge ... Yong Huang 2002