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Partially obstructed kidneys. Left, wild-type; right, iNOS −/−. A and B: F4/80, showing macrophages scattered through the cortical interstitium in 7-day-old mice. C and D: Picro-sirius red staining, showing collagen distribution in 7-day-old animals. E and F: Picro-sirius red staining in 21-day-old animals. In all cases, stainable material is largely confined to foci of collagen fibrils. Scale bar = 100 μm.
