The protein encoded by this gene is a member of the superfamily of ATP-binding cassette (ABC) transporters.ABC proteins transport various molecules across extra- and intra-cellular membranes.ABC genes are divided into seven distinct subfamilies (ABC1, MDR/TAP, MRP, ALD, OABP, GCN20, White).This protein is a member of the MRP subfamily which is involved in multi-drug resistance.The specific function of this protein has not yet been determined, however, this protein may play a role in cellular detoxification as a pump for its substrate, organic anions.Alternative splicing results in multiple splice variants encoding different isoforms.