Superfamily tree of PepD members in LAB. PepD that is experimentally characterized from Bifidobacterium longum NCC2705 (BLO)  and pepD genes from L. helveticus CNRZ32 (LHV) analyzed by microarray  are indicated by the red dots. Green circles represent the speciation events, while red squares represent duplication events.
Liu et al. BMC Genomics 2010 11:36 doi:10.1186/1471-2164-11-36