Ayers of polarized cellsc92 93Spontaneously differentiate in culture in polarized colonic cellsdAbbreviations: SI, sucrase-isomaltase; APN, aminopeptidase N; DPP IV, dipeptidylpeptidase IV; AP, alkaline phosphatase; CEACAMs, carcinoembryonic antigen cell adhesion molecules; CEA, carcinoembryonic antigen; VIP, vasoactive intestinal peptide; PAR2, protease-activated receptor 2; PEPT1, H /epycotransp