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Kinetics of 4-phenylphenol (A), 4-methylumbelliferone (B), and 4-nitrophenol (D) glucuronidation by UGT2A1. The aglycone substrate in the kinetic analysis for UDPGA (C) was 500 μM 4-methylumbelliferone. The analyses were done in triplicates and the SD error bars are presented.