part of part of fenestrated endothelial cell kidney capillary endothelial cell peritubular capillary endothelial cell An endothelial cell that is part of the peritubular capillary of the kidney. This cell is highly fenestrated and plays a vital role in the kidney's filtration process, enabling the exchange of materials between the blood and the renal tubules. KUPO:0001065 Peritubular capillary endothelial cells feature fenestrations measuring 60-70 nm in diameter, each traversed by a thin diaphragm. endothelium of peritubular capillary