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PCA score plot of (A) positive ion mode data and (B) negative ion mode data. The black circles represent the GNE samples, while the grey circles represent the control samples. The PCA analysis for the PIA showed the following validation parameters: R2X = 0.465 and Q2 = 0.306; while, for the NIA model, these were R2X = 0.654 and Q2 = 0.531.
