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Gene expression. (A) Tumour necrosis factor‐α (TNF‐α) gene expression in tilapia (Oreochomis niloticus) liver. (B) Interleukin‐8 (IL‐8) gene expression. (C) Insulin‐like growth factor 1 (IGF‐1) gene expression. (D) Growth factor gene expression. (E) fibroblast growth factor 20α (FGF‐20α) gene expression. Results are the mean ± SEM of representative values from five independent experiments. Statistical differences are indicated by P values. *P < 0·05; **P < 0·01.
