Kappa particles are Feulgen-positive and stain with Giemsa after acid hydrolysis.
2.
While there was initial confusion over the status of kappa particles as viruses, bacteria, organelles, or mere nucleoprotein, the particles are intracellular bacterial symbionts " Caedibacter taenospiralis " . " Caedibacter taenospiralis " contains cytoplasmic protein inclusions called R bodies which act as a toxin delivery system.
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