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Schematic model of Lactobacillus rhamnosus GG SpaCBA pili. In the proposed model, the heterotrimeric SpaCBA pili in GG are composed of shaft-forming SpaA major pilins together with SpaB and SpaC minor pilins. The SpaC adhesin can be found not only at the pilus tip but also throughout the pilus at a ratio with SpaA of approximately 1:2. The SpaB minor pilin is located at the pilus base, and few SpaB subunits can be found on the pilus fibers.
