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Phylogeny of a 292 bp fragment of citrate synthase (gltA) generated using minimum evolution algorithm (MEGA 4.1) with 1,000 bootstrap replicates. Species identities based on nearest match to type sequences from GenBank, clade identities based on second-step clades from the nested clade analysis. Two clades (Ur27 and Ur34) could not be assigned to a species with confidence
