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Maximum likelihood phylogenetic tree of truncated hemoglobin (trHb) proteins showing the close relationship of Sideroxydans lithotrophicus ES-1, Gallionella capsiferriformans ES-2, to Mariprofundus ferrooxydans PV-1, and compared to reference organisms, and other related Betaproteobacteria. Only bootstrap values above 50% are reported.
