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. 2007 Aug 15;104(34):13780–13785. doi: 10.1073/pnas.0706625104

Fig. 3.

Fig. 3.

PCA; 97% OTUs were encoded as presence/absence data for each sample, and the corresponding data matrix was subjected to PCA. Each circle, which is representative of a single sample and shaded according to disease status, is plotted along the first two principal component axes. Dashed lines denote nominal sample clusters, the Control subset and IBD subset.