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PCA score plots of 1H NMR data from serum of PAH rats. 3D PCA score plot generated from unsupervised PCA of NMR spectra of aqueous metabolites showing separate grouping for samples. Each point in the PCA score plot represents a specific individual sample, and samples with similar metabolic profiles are grouped together in clusters. (a) All rats; (b) W0 versus W1; (c) W1 versus W2-3; (d) W2-3 versus W4; (e) W4 versus W0.
