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Unrooted phylogenetic tree showing the archaeal OTUs obtained in the black soils with reference clones deposited in the GenBank. The OTU number marked with red, green, and blue letter represented the clones of Crenarchaeota, Euryarchaeota, and Thaumarchaeota, respectively. The reference archaeal clones marked with black letters. The black and gray circles indicate internal nodes with higher than 90 and 50% bootstrap support, respectively.
