title: Functional analysis of second-step host specificity mutations in unstable Escherichia coli heterozygotes.
mesh_terms: D003090:Coliphages; D004926:Escherichia coli; D005796:Genes; D005827:Genetics, Microbial; D005838:Genotype; D006579:Heterozygote; D006358:Hot Temperature; D009154:Mutation; D010641:Phenotype; D011995:Recombination, Genetic; D014161:Transduction, Genetic