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Principal components analysis (PCA) scores plots for urine samples of (A) normal group (red 
) vs. model group (green 
) and orthogonal partial least-squared discriminant analysis (OPLS-DA) scores plots of (B) normal group (red ) vs. model group (green ). (C) S-plot of OPLS-DA and (D) VIP-plot of OPLS-DA in negative mode.
