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Schematic of glomerular development showing capillary loop formation. (A) Endothelial and mesangial precursors migrate into the proximal cleft of the s-shaped tubule called the s-shaped body. (B) At the capillary loop stage, the endothelia have formed a single continuous tube that is sandwiched between basal lamina of the podocyte precursors and mesangial cells. (C) The capillary undergoes more extensive looping as glomerular development proceeds.
