title: Naturally occurring constitutive  -lactamase of novel serotype in Staphylococcus aureus.
mesh_terms: D007106:Immune Sera; D010405:Penicillinase / Q000032:analysis* / Q000145:classification; D012703:Serotyping; D013210:Staphylococcus / Q000201:enzymology*
chemical_list: D007106:Immune Sera; D010405:Penicillinase