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Principal component analysis (PCA) based on metabolic fingerprinting in negative ion mode of 113 taxa of Espeletiinae (representing 210 samples and 4181 variables). (a) Scores plot showing the clustering of samples according to their country of origin (Venezuelan samples in red and Colombian in blue) and (b) loadings plot. Discriminant mass signals in the loadings plot are labeled according to their MZmine IDs. For compound identities, please refer to Table 1.
