Bilirubin glucuronides (BMG and BDG) are transported out of hepatocytes through their apical surfaces into the bile ducts, mainly by ABCC2 (MRP2) but also by the tetrameric efflux pump ATP-binding cassette sub-family G member 2 (ABCG2) (Xu et al. 2004).
Xu, J, Liu, Y, Yang, Y, Bates, S, Zhang, JT
bilirubin transmembrane transporter activity of ABCG2 tetramer [plasma membrane]
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