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Multivariate data analysis. (a) Principal component analysis (PCA) score map derived from UPLC-MS in the normal rats (◇) and hyperuricemia model rats (▽). (b) Orthogonal projections to latent structures-discriminant analysis (OPLS-DA) score. (c) Validation plot obtained from 200 permutation tests. (d) The loading scatter plot of OPLS-DA.
