title: On the nature of the Mu-factor.
mesh_terms: D002247:Carbon Isotopes; D002499:Centrifugation, Density Gradient; D002876:Chromosomes, Bacterial; D003227:Conjugation, Genetic; D004269:DNA, Bacterial / Q000032:analysis; D004352:Drug Resistance, Microbial; D004926:Escherichia coli; D005111:Extrachromosomal Inheritance; D005827:Genetics, Microbial; D011511:Proteus; D012706:Serratia marcescens; D013307:Streptomycin / Q000494:pharmacology; D013941:Thymine / Q000378:metabolism; D014316:Tritium
chemical_list: D002247:Carbon Isotopes; D004269:DNA, Bacterial; D014316:Tritium; D013941:Thymine; D013307:Streptomycin