title: Naturally occurring viral R plasmid with a circular supercoiled genome in the extracellular state.
mesh_terms: D001435:Bacteriophages / Q000378:metabolism* / Q000648:ultrastructure; D004270:DNA, Circular / Q000378:metabolism*; D004279:DNA, Viral / Q000378:metabolism*; D005111:Extrachromosomal Inheritance; D009690:Nucleic Acid Conformation; D010403:Penicillin Resistance; D010957:Plasmids; D011815:R Factors; D012242:Rhodobacter sphaeroides; D014161:Transduction, Genetic / Q000528:radiation effects; D014466:Ultraviolet Rays
chemical_list: D004270:DNA, Circular; D004279:DNA, Viral