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OPLS-DA 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 OPLS-DA analysis for the PIA showed the following validation parameters: R2X = 0.336, R2Y= 0.906, and Q2 = 0.799; while, for the NIA model, they were R2X = 0.575, R2Y= 0.921, and Q2 = 0.865.
