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Topology of the Gsp proteins. Schematic of the topology of each individual component of the secreton. The domains of the Gsp proteins discussed in the review are mentioned. The colour code used is the one generally used in all figures, i.e. blue for OM secretin, green for IMP components and orange/red for pseudopilins. The N terminus (Nt) and the transmembrane (TM) domain of each Gsp protein are indicated where appropriate. CC, coiled coil.
