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Inner area of the renal medulla. 0.5 µm thick section of material embedded in plastic, stained with a silver method. Two longitudinally sectioned Bellini ducts are seen at the left and right edges of the image. They are lined by a tall, simple prismatic epithelium that, at this point, is made up of only clear main cells. The space among the ducts is occupied by very thin tubes, in which two types