title: The steric effect in lysogenization by bacteriophage lambda. IV. Superinfection of nonimmune lysogens.
mesh_terms: D003090:Coliphages; D003673:Defective Viruses; D004926:Escherichia coli; D005816:Genetic Complementation Test; D005827:Genetics, Microbial; D006378:Helper Viruses; D006824:Hybridization, Genetic; D008242:Lysogeny; D009154:Mutation