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mRNA expression levels of heat shock protein-70 (HSP70), growth hormone (GH), interleukin-1 beta (IL-Iβ) and interleukin-8 (IL-8) genes in the liver tissue of Nile tilapia, Oreochromis niloticus (mean ± MSE) fed on diets supplemented with graded levels of β-glucan and/or Bacillus coagulans for 14 weeks. Columns with different superscribt letters are significantly different (P<0.05).
