Quercetin glucuronidation assays of UGT1A1*1CFP/1A9*NHA double expression systems.
Concentration of quercetin was 100 μM ◻ and ◼ indicate single and double expressions, respectively. N.D., not detectable. Data are mean ± SD from triplicate experiments. Asterisks indicate statistically significant differences (***P < 0.0001; **P < 0.005; *P < 0.05). T-UGT1A1*1CFP + UGT1A9*NHA indicates the algebraic sum of the theoretical activity of single expressed UGT1A1*1 and UGT1A9*N.