title: Absence of immunity to superinfection in spheroplasts of a lysogen.
abstract: Penicillin-induced spheroplasts of Salmonella typhimurium strain LT2 lysogenic for bacteriophage P22, appear to lose immunity to superinfection by homologous phage.
mesh_terms: D005827:Genetics, Microbial; D009154:Mutation; D010406:Penicillins / Q000494:pharmacology; D011523:Protoplasts / Q000276:immunology*; D012483:Salmonella Phages / Q000254:growth & development*; D012486:Salmonella typhimurium / Q000187:drug effects / Q000276:immunology*
chemical_list: D010406:Penicillins