title: Improvement of the specificity of an antiserum to  -lactamase by absorption with a mutant which does not produce the enzyme.
abstract: Absorption of antiserum to crude beta-lactamase with a mutant strain lacking the enzyme produced specific beta-lactamase antiserum.
mesh_terms: D000042:Absorption; D000818:Animals; D002850:Chromatography, Gel; D003429:Cross Reactions; D004754:Enterobacter / Q000201:enzymology / Q000276:immunology; D005827:Genetics, Microbial; D007106:Immune Sera / Q000592:standards*; D007120:Immunochemistry; D007122:Immunoelectrophoresis; D008722:Methods; D009154:Mutation; D010405:Penicillinase / Q000096:biosynthesis; D011817:Rabbits / Q000276:immunology; D014462:Ultrafiltration
chemical_list: D007106:Immune Sera; D010405:Penicillinase