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Phylogenetic tree of 16S/18S rRNAs from all genera represented in this study with the exceptions of Acidobacteria, Ashbya, Cryptococcus and Thlaspi. All bacterial rRNAs appear at the top of the tree, the eukaryotic rRNAs are at the bottom of the tree and the three archaeal genera are positioned on the central branch on the right-hand side of the tree. The phylum/kingdom is indicated for each of the clusters, while the genus is shown at the end of each branch
