title: Transfer-defective mutants of sex factors in Escherichia coli. I. Defective mutants and complementation analysis.
mesh_terms: D001435:Bacteriophages; D002876:Chromosomes, Bacterial; D004926:Escherichia coli; D005816:Genetic Complementation Test; D009154:Mutation; D012737:Sex Factors; D014161:Transduction, Genetic