title: A topological model for the origin of catenated circular DNA. (A theoretical approach).
mesh_terms: D004261:DNA Replication; D004269:DNA, Bacterial; D004277:DNA, Single-Stranded; D004279:DNA, Viral; D008928:Mitochondria; D008956:Models, Chemical
chemical_list: D004269:DNA, Bacterial; D004277:DNA, Single-Stranded; D004279:DNA, Viral