title: Production of serum-blocking material by mutants of the left arm of the lambda chromosome.
mesh_terms: D000941:Antigens / Q000096:biosynthesis*; D002875:Chromosomes; D003090:Coliphages; D004926:Escherichia coli; D005796:Genes; D005827:Genetics, Microbial; D008242:Lysogeny; D009154:Mutation; D009500:Neutralization Tests
chemical_list: D000941:Antigens