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Effect of heat stress and L-citrulline supplementation on nitric oxide production during acute heat stress. (A) NO concentration. (B) Total NO synthase activity. (C) Inducible NO synthase activity. (D) Endothelial NO synthase activity. (E) Arginase activity. Data are presented as mean ± SEM (n = 8). a,bDifferent letters indicate significant difference of D×E interaction at P < 0.05.
