Localization of podoplanin, podocalyxin, and CD31 in consecutive paraffin sections of a normal human lymph node by immunoperoxidase. A: Podoplanin is located in marginal sinusoidal lining cells (SIN), but not in endothelial cells of HEV. B: The endothelial marker podocalyxin immunostains sinus lining cells and HEV endothelia. C: Endothelia of HEV are prominently stained with CD31. Magnification, ×450.