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Western blot analysis of protein expression of genes in the PI (A), MI (B), and DI (C) of the on-growing grass carp (Ctenopharyngodon idella) fed diets with graded levels of VD3 (IU/kg) for 10 weeks. Mean values ± SD. n = 6 for each bar. Different letters above the bars indicate significant difference (ANOVA and Duncan's multiple-range test, P < 0.05). PI = proximal intestine; MI = mid intestine; DI = distal intestine.
