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Immunohistochemical analysis of iNOS, eNOS, HO-1 and ICAM-1. Magnification, ×400. Arrows indicate positive staining. MLT, melatonin; HO-1, heme oxygenase-1; iNOS, inducible nitric oxide synthase; eNOS, endothelial nitric oxide synthase; ICAM-1, intercellular adhesion molecule-1.
