SUMMARY: swarmer cells, when synchronized by selective filtration, differentiate synchronously with the loss of motility and synthesis of a prostheca, and subsequently form a daughter cell. Synchronized swarmer cells synthesized an 11·5 kDa protein under dark anaerobic conditions which disappeared from the soluble fraction when the culture was subsequently incubated in the light and the differentiation cycle thus initiated. The protein did not accumulate under dark aerobic conditions and it may play a role in the inhibition of differentiation in the light limited and thus energy limited swarmer cell.


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