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In maturing stage glomeruli, a well developed, thin and extensively fenestrated endothelium (En) is evident. Double basement membranes are generally absent, but several examples of subepithelial projections of basement membrane can be seen (*). In the podocyte layer (Po) foot process (fp) interdigitation is well underway, and the filtration slits are spanned by slit diaphragms (arrows). CL: capillary lumen; US: urinary space. Reproduced with permission (ref. 38).
