Phylogenetic tree of homoserine acetyltransferase proteins. T. pseudonana protein is marked with an asterisk. The phylogenetic tree was reconstructed using the maximum likelihood method implemented in the PhyML program (curated alignment with 105 characters was used). The T. pseudonana protein is marked with an asterisk. Reliability for internal branch was assessed using the aLRT. The number next to species name represents entry code of given protein in a databank.