Confocal immunofluorescence microscopy was performed for nephrin (red, podocytes) and cell-specific markers to identify podocytes, mesangial cells, and the endothelium. (A) Costain for nephrin and WT1 (green, podocytes). (B) Costain for nephrin and PDGFR-β (green, mesangial cells, arrow). (C) Costain for nephrin and CD31 (green, endothelial cells, vessels in cross section marked by arrowheads). Scale bar = 25 μm on all panels.