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Effects of ozone on iNOS, COX-2, and arginase-1 expression. Lung sections, prepared 3–72h after exposure of rats to air or ozone, were stained with antibody to iNOS, COX-2, or arginase-1. Binding was visualized using a peroxidase DAB substrate kit. One representative section from three rats per treatment group is shown (original magnification, ×20).
