Figure 1
From: Protein secretion systems in bacterial-host associations, and their description in the Gene Ontology
![Figure 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2F1471-2180-9-S1-S2/MediaObjects/12866_2009_Article_950_Fig1_HTML.jpg)
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.