title: Host specificity of DNA in Haemophilus influenzae: the two restriction and modification systems in strain Ra.
mesh_terms: D001434:Bacteriophage Typing; D004269:DNA, Bacterial; D005827:Genetics, Microbial; D006193:Haemophilus influenzae; D009154:Mutation; D010641:Phenotype; D012703:Serotyping
chemical_list: D004269:DNA, Bacterial