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OPLS-DA score plots of different groups in ESI+ and ESI- mode respectively. The score plots of OPLS-DA of NC, ALI, RA-L, RA-M and RA-H from OPLS-DA analysis in ESI+ (A) and ESI- (B); Metabolites with VIP >1 of ALI vs. NC were marked with a red triangle in ESI+ (C) and ESI- (D); Metabolites with VIP >1 of ALI vs. RA-H were marked with a red triangle in ESI+ (E) and ESI- (F).
