Enables the transfer of bilirubin from one side of a membrane to the other. Bilirubin is a linear tetrapyrrole produced in the reticuloendothelial system from biliverdin and transported to the liver as a complex with serum albumin. In the liver, bilirubin is converted to bilirubin bisglucuronide, which is excreted in the bile.
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Reactome:R-HSA-5679031 "Defective ABCC2 does not transport BMG,BDG from cytosol to extracellular region"; Reactome:R-HSA-9661417 "ABCG2 tetramer transports BMG,BDG from cytosol to extracellular region"; reactome:R-HSA-5679041 "ABCC2 transports BMG,BDG from cytosol to extracellular region"