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Effect of caffeine (CAF) on the P-gp, BCRP, and Mrp4 expression in the intestines of mice treated with vehicle (NOR) or caffeine (CAF). (A) Effect in the small intestine. (B) Effect in the large intestine. The transporter expression was assessed by qPCR. Data are shown as the mean ± S.D. (n = 6). Means with same letters are not significantly different (p < 0.05).
