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a) Principal coordinate analysis (PCoA) scatterplot of the normalized relative abundance of all samples, divided by type of material (red: synthetic and green: natural). Data are plotted at the genus-level classification. b) Partial least square-discriminant analysis (PLS-DA) depicts Pearson distance between different samples using phylogeny distribution based on 16S rRNA genes. Samples are, respectively, coloured according to sampling points.
