title: Acquired resistance and natural insensitivity to chemotherapeutic drugs.
mesh_terms: D000900:Anti-Bacterial Agents / Q000096:biosynthesis; D001419:Bacteria / Q000187:drug effects; D002875:Chromosomes / Q000187:drug effects; D004358:Drug Therapy; D005827:Genetics, Microbial; D049672:History, 19th Century; D049673:History, 20th Century; D008829:Microbiology / Q000266:history; D009154:Mutation; D010403:Penicillin Resistance; D010406:Penicillins / Q000494:pharmacology; D011815:R Factors; D013210:Staphylococcus; D014780:Viruses / Q000187:drug effects
chemical_list: D000900:Anti-Bacterial Agents; D010406:Penicillins