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Schematic diagrams of tubular organization in the rat renal medulla. (a): Cross-section through the inner stripe of outer medulla, where tubules appear to be organized around a vascular bundle. (b) Cross section through the upper inner medulla, where tubules and vessels are organized around a collecting duct cluster. Inset: schematic configuration of a collecting duct, ascending vasa recta (AVR), an ascending thin limb, and a nodal space. Reprinted from [31].
