Once GSTA1 and FABP1 proteins transport bilirubin to the ER, it is assumed they must dissociate from BIL ((Levi et al. 1969, Simons & Jagt 1980) to allow its translocation, most likely by simple diffusion, into the ER lumen.
Gatmaitan, Z, Levi, AJ, Arias, IM
Simons, PC, Jagt, DL
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