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Antibacterial compound activity or contents (A–D) and relative mRNAs of antibacterial peptides (E) in the gill of on-growing grass carp fed diets containing various vitamin A levels for 10 weeks, which were then infected by F. columnare. The values shown are means (n = 6); error bars indicate SD. Different letters indicate the significant differences (P < 0.05). β-actin was used as an internal control gene. LEAP, liver-expressed antimicrobial peptide.
