title: A new species of small covalently closed f1 DNA in Escherichia coli infected with an amber mutant of bacteriophage f1.
mesh_terms: D002499:Centrifugation, Density Gradient; D003090:Coliphages / Q000032:analysis* / Q000254:growth & development / Q000378:metabolism; D004261:DNA Replication; D004270:DNA, Circular / Q000032:analysis; D004279:DNA, Viral / Q000032:analysis* / Q000096:biosynthesis; D004926:Escherichia coli / Q000378:metabolism*; D009154:Mutation; D009693:Nucleic Acid Hybridization; D010759:Phosphorus Isotopes; D013936:Thymidine / Q000378:metabolism; D014316:Tritium
chemical_list: D004270:DNA, Circular; D004279:DNA, Viral; D010759:Phosphorus Isotopes; D014316:Tritium; D013936:Thymidine