Sinorhizobium fredii encodes TpiB xenologs. Sinorhizobium fredii contains a second suboperon thatappears homologous to the eryR-tpiB-rpiB suboperon in theerythritol locus (Figure 1). The TpiB aminoacid sequence was used as a representative of this suboperon toconstruct a phylogenetic tree. The branch corresponding to the TpiBencoded outside of the erythritol locus is highlighted in red. The treewas constructed using ML and Bayesian analysis. Support for each node isexpressed as a percentage based on posterior probabilities (Bayesiananalysis) and bootstrap values (ML). The branch lengths are based on MLanalysis and are proportional to the number of substitutions persite.