SUMMARY: The base composition, DNA was found to be 62·2% GC, and the genome size was 2·1 × 10 daltons. There was no detectable difference between DNA from each of the three cell expressions examined. Reassociation kinetics indicated that no large group of repeated sequences was present, but that 5 % of the genome was composed of extremely rapidly reassociating sequences. No plasmids were detected. Electron microscopic examination showed that DNA contained short inverted repeat sequences on average 400 base pairs long. The possible function of these sequences is discussed.


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