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Maximum-likelihood phylogenetic trees of Hydrogenophaga-related (A) and Erysipelothrix-related (B) 16S rRNA sequences. For each tree, the representative tag sequence was placed next to its most likely neighbor in the reference phylogeny of nearly full-length sequences by using the evolutionary placement algorithm (32). Each tree represents the best topology after 20 maximum-likelihood references, and all nodes in the reference phylogeny received 100% bootstrap support.
