Abstract
The plasmid content of 7 unicellular and 4 filamentous cyanobacterial strains has been analyzed. All strains were found to carry small plasmids while some strains harbor large plasmids up to approx. 400 kb. In addition, at least one megaplasmid of about 1000 kb was detected in the unicellular strain Synechococcus PCC7942. In the filamentous strain Calothrix PCC7601, 2 different distribution patterns of plasmids were observed in different subcultures, suggesting the presence of mobile DNA elements in this strain.
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