Research Article

Parallel Evolution and Horizontal Gene Transfer of the pst Operon in Firmicutes from Oligotrophic Environments

Figure 3

Maximum likelihood phylogeny of Firmicutes based on the concatenated amino acid sequence of 14 housekeeping genes and dated with a penalized likelihood method. The branch colors indicate the type of operon present in each taxon. Tag colors refer to the type of habitat. Clade I corresponds to aerobic Firmicutes and clade II includes CCB and marine Bacillus. Clade I had a fixed age of 2300 my and clades III and IV had a fixed minimum age of 35 my. Bootstrap values above 70% are denoted with an asterisk. Clades with branch lengths of 0 were collapsed (D. hafniense DCB-2-D. hafniense Y51 and G. thermodenitrificans NG80-2-G.sp. G11MC16).
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