Mutant Hfr strains defective in transfer: restoration by F-like and I-like de-repressed R factors.
D003090:Coliphages; D003227:Conjugation, Genetic; D004794:Enzyme Repression; D004926:Escherichia coli; D005111:Extrachromosomal Inheritance; D011995:Recombination, Genetic; D012723:Sex