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Immunostaining of stress proteins within rat kidneys: HSP72 after melatonin (MEL) (A), mercuric chloride (HgCl2) (B), and MEL + HgCl2 (C); metallothionein (MT) after MEL (D), HgCl2 (E), MEL + HgCl2 (F); GRP75 after MEL (G), HgCl2 (H), and MEL + HgCl2 (I). Negative immunohistochemical control after MEL (L), HgCl2 (M), MEL + mercuric chloride (N). Nuclear positivity (arrows), proximal tubules (P). Sections were counterstained by Mayer's hematoxylin.
