Abstract
The glomerular epithelial cells of the rat kidney fixed by vascular perfusion with an aldehyde solution containing either safranine O or alcian blue (and 0.3 M MgCl2) display filaments which are located close to the outer surface of the plasma membrane. These filaments are similar to those revealed by the same methods in the laminae rarae of the glomerular basement membrane. Alcian blue (and MgCl2) further demonstrates the presence of anionic sites inside the endothelial cell pores of the glomerular and peritubular capillaries, on the luminal surface of endothelial cells of large renal vessels and along the basolateral surface of the epithelial cells of the Bowman capsule and of the proximal convoluted tubule.
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