Probable transporter, its substrate specificity is unknown. Localizes to the midpiece of the sperm tail. High expressed in testis. Belongs to the ABC transporter superfamily. ABCC family. Conjugate transporter (TC 3.A.1.208) subfamily. Does not transport any of the organic anions transported by the other multidrug resistance-associated proteins (MRPs) in vesicular transport assays, nor does it confer resistance to cytotoxic agents in intact cell assays.