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Principal component analysis (PCA) based on the relative abundance of 16S rRNA genes from 15 samples (5 sites × 3 replicates per stage). The scatterplot shows principal coordinate 1 (PC1) vs. principal coordinate 2 (PC2). The percentages of variation in the samples described by the plotted PCs are shown on the axes. The 3 replicates for each site are represented by a single color.
