Maximum likelihood tree of pyruvate carboxylase carboxyl tranferase (PCT) domainsequences. This tree is based on 126 representative sequences and 432 conserved sites and wasmidpoint rooted. Numbers at nodes indicate bootstrap robustness values higher than 50. Colors onleaves represent the affiliation of the sequences to their respective domain of life: archaea (red),bacteria (blue) and eukaryotes (green). Bars on the right report the functional assignment of thesequences; sequences that are not in front of any bar have unknown function.