Fig. 2

Enzyme activity of nitric oxide synthase isoforms in broilers fed arginine deficient diets supplemented with arginine or L-citrulline. (A) Plasma tNOS (B) Plasma eNOS (C) Kidney eNOS (D) Liver eNOS. PC: Positive control; NC: Negative control; NCL: Negative control + L-citrulline. Data are presented as mean ± SEM (n = 7 to 8). Data are significantly different at *P ≤ 0.05; **P < 0.01; ***P < 0.001