The relative expression of Cctlr19 in various tissues of common carp after i.p. injection with A. hydrophila. The expression of Cctlr19 in the liver (A), spleen (B), head kidney (C), foregut (D), hindgut (E) and skin (F) at different time points is shown. The results were calculated relative to the expression of the 40S ribosomal protein S11 gene. Data are presented as a fold increase compared to the unstimulated control group (denoted by 0 h). Means ± SD (n = 3), *P < 0.05, **P < 0.01, ***P < 0.001, ****P < 0.0001, one-way ANOVA.