Figure 1.

Summary of known bacterial secretion systems. In this simplified view only the basics of each secretion system are sketched. HM: Host membrane; OM: outer membrane; IM: inner membrane; MM: mycomembrane; OMP: outer membrane protein; MFP: membrane fusion protein. ATPases and chaperones are shown in yellow.

Tseng et al. BMC Microbiology 2009 9(Suppl 1):S2   doi:10.1186/1471-2180-9-S1-S2