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Relative expression of CK, atp1a1a.1, and atp1a1a.4 in the PI, MI, and DI of on-growing grass carp (Ctenopharyngodon idella) fed diets containing graded levels of VD3 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). VD3 = vitamin D3; PI = proximal intestine; MI = mid intestine; DI = distal intestine; CK = creatine kinase.
