Superfamily tree of PepP/PepQ/PepM members in LAB. Genome abbreviations can be found in "Methods". For each gene, the organism abbreviations are followed by GI codes. Homologs from two non-LAB strains are also included, CBO for Clostridium botulinum F str. Langeland and ECO for E. coli. Experimentally characterized genes are highlighted by the red dots. Green circles represent the speciation events, and red squares represent duplication events.
Liu et al. BMC Genomics 2010 11:36 doi:10.1186/1471-2164-11-36