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Maximum-likelihood 16S rRNA gene phylogeny of Thiothrix. Sequences obtained from Southern Dobrogean niphargid samples are in red, those contained in the Movile mat clone library in blue. Cultivated Thiothrix strains are in bold. Accession numbers of sequences downloaded from GenBank are given in parentheses. Maximum-likelihood/neighbour-joining bootstrap values greater than 50 are displayed next to the respective nodes.
