in contrast , gradient perfusion of the epithelium with 75 mosm pbs on the apical side and 290 mosm pbs on the basal side for 10 min alters the morphology of the epithelium by causing the originally columnar epithelial cells to become lower , the intercellular spaces to dilate , and the intracellular vesicles to enlarge .
C0014609
epithelium
C0225338
columnar epithelial cells