R bodies (from refractile bodies, also R-bodies) are polymeric protein inclusions formed inside the cytoplasm of bacteria.[1] Initially discovered in kappa particles, bacterial endosymbionts of the ciliate Paramecium, R bodies (and genes encoding them) have since been discovered in a variety of taxa.[2]
Jessica Polka's electron micrograph of negatively stained purified type 51 R bodies in their extended (low pH) state
https://en.wikipedia.org/wiki/R_bodies
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