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(A) The effect of pH on imperialine in Caco-2 cell monolayer transport (n=3): cP<0.01 compared with the pH 7.4 group. (B) The transport rate of imperialine across the Caco-2 cell monolayer (n=3): (a) from the AP to the BL side and (b) from the BL to the AP side. (C) Papp of imperialine across the Caco-2 cell monolayers (n=3).
