cell ( plasma ) membranes were the site of localization , especially at areas where it has been proposed that active transport mechanisms may occur , namely , on the microvilli of intestinal epithelium , endothelial lining of capillaries , glomerular epithelial cell membranes , basal infoldings of the cell membrane of renal tubules , on the microvilli of bile canaliculi , and on the microvilli of proximal convoluted tubular epithelial cells .
C0014609
epithelium
C0014597
epithelial cell