Fig. 5.

Concentrations of arginine-related metabolites in serum from mice (9 months post-infection). The concentration of arginine (a), urea (b), citrulline (c) and ornithine (d) was quantified by an ion-exchange AA analyzer. e The concentration ratio between urea and arginine (Arg). f The ratio between citrulline (Cit) and arginine. g The ratio between ornithine (Orn) and arginine. h The ratio of arginine/(citrulline + ornithine). i The total concentration of nitrite, used as a quantitative measure of NO production. The differences were analyzed by a Student’s t-test. *P < 0.05, **P < 0.01, ***P < 0.001