SUMMARY: The bacterial endosymbiont kappa of stock A35 of (syngen 2) carries virus-like inclusions after it has developed a refractile or R body which is necessary for kappa to exert the killing effect.

In exponentially growing the proportion of symbionts bearing R bodies and virus-like inclusions is very low. On starvation, R bodies and virus-like inclusions reappear, and the proportion builds up to between one-quarter and one-half of the total number of symbionts in a cell. Thus the development of R bodies, virus-like inclusions and killing action is influenced by the environment of the host Paramecium cell.


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