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Relative abundance distribution of bacterial OTUs among samples. OTUs are labeled according to their taxonomic assignment by the GAST process (22). α, Alphaproteobacteria; Bact, Bacteroides; Cflx, Chloroflexus; δ, Deltaproteobacteria; ε, Epsilonproteobacteria; Firm, Firmicutes; γ, Gammaproteobacteria.
