“…This structure is assumed to represent a `small pore system' proposed by physiologists in relation to the transendothelial transport mechanism (LANDIS and PAPPENHEIMER,1963). However, the occasional occurrence of the stratified lamina f enestrata has been reported in the glomerular capillary of both the rat and rabbit kidney (WOLFF and MERKER, 1966;YOSHINARI and FUJITA, 1982;FUJITA and MIYOSHI, 1985), and in the sinusoidal endothelium of the liver and adrenal cortex of monkeys and guinea pigs (NOZAKI and MIYOSHI, 1984;OHATA et al, 1984). Furthermore, the lamina fenestrata has been described as occurring even on the thickened perikaryal portions of the glomerular endothelium of the kidney, designated as pored domes (YOSHINARI and FUJITA, 1982).…”