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Representative histology images at ×20 objective magnification (A) and quantification of picrosirius red staining (B) of renal medullary fibrosis from 2-, 11-, and 20-mo-old Fischer rats. Values are means ± SE; n = 7 for all age groups. *P < 0.05 vs. 2 mo. †P < 0.05 vs. 11 mo.
