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GC-MS results of FFAs and EFAs of rat serum: (a) the partial least squares discriminant analysis (PLS-DA) score plot of FFAs and EFAs level data sets (after automatic transformation). R2Y (cum) = 0.57, Q2 (cum) 0.50; and (b) A heatmap of FFAs and EFAs of GC-MS contributing to the classification of PLS-DA [Variable Importance in the Projection (VIP) value ≥ 1].
