title: On the origin of tertiary turns in covalently closed double-stranded cyclic DNA.
mesh_terms: D001435:Bacteriophages; D002586:Cesium; D003090:Coliphages; D004279:DNA, Viral / Q000032:analysis / Q000378:metabolism*; D004492:Edetic Acid; D004926:Escherichia coli / Q000201:enzymology; D008025:Ligases / Q000378:metabolism; D008274:Magnesium; D008837:Micrococcus; D011119:Polynucleotides / Q000378:metabolism*; D013696:Temperature; D014461:Ultracentrifugation
chemical_list: D004279:DNA, Viral; D011119:Polynucleotides; D002586:Cesium; D004492:Edetic Acid; D008025:Ligases; D008274:Magnesium