confluent monolayers of well-differentiated enterocyte-like cells with functional properties of transporting epithelia, and retains various influx and efflux transporters expressed in the intestine, such as H -coupled oligopeptide transporter 1 (PEPT1), P-glycoprotein (P-gp), multi-drug resistance proteins (MRPs), and breast cancer resistance protein (BCRP). Caco-2 cells have been widely used a...