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Killing trait RebB is one of three proteins necessary for the production of R- bodies, refractile inclusion bodies produced by a small number of bacterial species, essential for the expression of the killing trait of the endosymbiont bacteria that produce them for attack upon the host Paramecium. R-bodies are highly insoluble protein ribbons which coil into cylindrical structures in the cell and the genes for their synthesis and assembly are encoded on a plasmid. One of these three proteins is RebB.
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