S100A9 and infection: On day 7 post-infection, the concentration of serum AST was 1,467 ± 110 IU/L in MRP14-injected mice and 833 ± 89 IU/L in PBS-injected mice, and the concentration of serum ALT was 338 ± 66 IU/L in rMRP14-injected mice and 151 ± 40 IU/L in PBS-injected mice.