The rule of the ring.
D002247:Carbon Isotopes; D002852:Chromatography, Ion Exchange; D002869:Chromosome Aberrations; D002874:Chromosome Mapping; D003090:Coliphages; D003582:Cytogenetics; D004269:DNA, Bacterial; D004279:DNA, Viral; D003851:Deoxyribonucleases; D005815:Genetic Code; D008854:Microscopy, Electron; D008954:Models, Biological; D009691:Nucleic Acid Denaturation; D010759:Phosphorus Isotopes; D012486:Salmonella typhimurium / Q000378:metabolism; D014161:Transduction, Genetic; D014774:Virulence
D002247:Carbon Isotopes; D004269:DNA, Bacterial; D004279:DNA, Viral; D010759:Phosphorus Isotopes; D003851:Deoxyribonucleases