Quantitative expression of immune-related genes in spleen (a), anterior (b) and posterior (c) intestine of European sea bass fed different diets for 29 days.

<p>Data are presented as means ± SEM (n = 6). Bars represent fold change of Arg1 (dark grey columns) and Arg2 (light grey columns) relatively to the CTRL group, previously normalized to endogenous β-Actin expression levels. Asterisks indicate significant differences relatively to CTRL group; section sign indicates differences between arginine supplementation levels (One-way ANOVA; P < 0.05)