title: Stepwise introduction of transformable penicillin resistance in Pneumococcus.
mesh_terms: D002999:Clone Cells / Q000378:metabolism; D004269:DNA, Bacterial; D008040:Genetic Linkage; D005838:Genotype; D008712:Methicillin / Q000494:pharmacology; D009154:Mutation; D010068:Oxacillin / Q000494:pharmacology; D010400:Penicillin G / Q000494:pharmacology; D010403:Penicillin Resistance; D012641:Selection, Genetic; D013296:Streptococcus pneumoniae / Q000187:drug effects*; D013307:Streptomycin / Q000494:pharmacology; D013449:Sulfonamides / Q000494:pharmacology; D014170:Transformation, Genetic
chemical_list: D004269:DNA, Bacterial; D013449:Sulfonamides; D010400:Penicillin G; D008712:Methicillin; D010068:Oxacillin; D013307:Streptomycin