Dongen, J.M. van

crypt activity villu goblet cells enzyme goblet increase proliferation differentiation study change animal number position phosphatase crypt cell proliferation intestine endoplasmic reticulum control compartment epithelium irradiation cell proliferation proliferative development esterase proliferative activity villi ultrastructural crypt cells paneth cells esterase activity localization phosphatase activity reticulum x-irradiation electron migration crypt cell differentiation endoplasmic columnar proliferative cell compartment epithelial columnar cells villus cells microvilli galjaard mitochondria epithelial cells result 400 r x-irradiation golgi apparatus section terminal web cell position protein cell res recovery villou effect tissue esterases paneth decrease organelle 72 hours control animals golgi function synthesis villous cells length enzyme activity subcellular bottom krypt cell age system secretion granules ultrastructure