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OPLS-DA score plot: the predictive (x-axis) and orthogonal (y-axis) components. Separation of classes is maximized along the predictive component, while the orthogonal component accounts for intra-class variability. Group 1 (green dots): no-CAD/high-RF vs. Group 4 (red dots): CAD/high-RF. The variable importance in projection (VIP) scores allowed further identification of the metabolites responsible for the separation between the two phenotypic groups.
