title: Covalently closed circular DNAs in closely related unicellular cyanobacteria.
abstract: Plasmids of Synechococcus cedrorum and two Anacytsis nidulans strains were characterized physically, and a probable instance of spontaneous "curing" is described.
mesh_terms: D002499:Centrifugation, Density Gradient; D000458:Cyanobacteria / Q000032:analysis* / Q000254:growth & development; D004262:DNA Restriction Enzymes; D004270:DNA, Circular / Q000032:analysis*; D008970:Molecular Weight; D009690:Nucleic Acid Conformation; D010957:Plasmids
chemical_list: D004270:DNA, Circular; D004262:DNA Restriction Enzymes