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Phylograms of SelA, SelB, and FdhA sequences from Alphaproteobacteria, Betaproteobacteria, and Gammaproteobacteria. Organisms and phyla are shown by different colors. Red indicates Alphaproteobacteria, blue indicates Betaproteobacteria, green indicates Gammaproteobacteria/Pseudomonadales, and pink indicates other Gammaproteobacteria. In the FdhA phylogram, U represents Sec-containing sequences and C Cys-containing sequences.
