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Effects of MLP supplementation on the (A) ZO-1, (B) occludin, and (C) claudin mRNA expression levels in the tracheal tissue of NDV-vaccinated chicks. Data are presented as means ± SD (n = 6); ∗P < 0.05, ∗∗P < 0.01. Abbreviations: BC, blank control; MLP, mulberry leaf polysaccharide; MLP-M, MLP at a dose of 4 mg; NDV, Newcastle disease virus; VC, vaccine control.
