Fig. 4From: Effects of arginine replacement with L-citrulline on the arginine/nitric oxide metabolism in chickens: An animal model without urea cycleGene expression of arginine metabolizing enzymes in the tissues of broilers fed arginine deficient diets supplemented with arginine or L-citrulline. (A) Liver (B) Kidney. PC: Positive control; NC: Negative control; NCL: Negative control + L-citrulline. Data are presented as mean ± SEM (n = 8). Data are significantly different at *P < 0.05; **P < 0.01Back to article page