title: Formation of covalently closed cyclic dimers and catenanes of Escherichia coli phage lambda in the absence of known recombination systems.
mesh_terms: D002501:Centrifugation, Zonal; D003090:Coliphages / Q000378:metabolism*; D004270:DNA, Circular / Q000378:metabolism*; D004279:DNA, Viral / Q000378:metabolism* / Q000528:radiation effects; D005144:F Factor; D008970:Molecular Weight; D009690:Nucleic Acid Conformation; D011995:Recombination, Genetic; D014965:X-Rays
chemical_list: D004270:DNA, Circular; D004279:DNA, Viral