Caco-2 versus Caco-2/HT29-MTX co-cultured cell lines: permeabilities via diffusion, inside- and outside-directed carrier-mediated transport - Hilgendorf,C.; Spahn-Langguth,H.; Regardh,C.G.; Lipka,E.; Amidon,G.L.; Langguth,P. (J Pharm Sci, 2000)