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YKL-40 expression in deceased donor kidneys. Biopsy samples from deceased donors with measured urinary YKL-40 levels of (A) 0.76 ng/ml, (B) 43 ng/ml, and (C) 97 ng/ml. Urinary YKL-40 concentrations correspond with YKL-40 staining intensity in renal tubular epithelial cells. The three samples were stained with 3,3-diaminobenzidine tetrahydrochloride and counterstained with hematoxylin. Original magnifications are ×400.
