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(Color online) Relative content of differential metabolites in chronic kidney disease (CKD) model rats. Serum levels of L-cysteine, L-cystine, L-isoleucine, L-arginine, L-aspartic acid, and L-phenylalanine in rats from each group ( , compared with the control group, #p < 0.05, ##p < 0.01; compared with the model group, *p < 0.05, n = 15, ns: not significant).
