title: The molecular evolution of antibiotic resistance genes in gram-negative bacteria.
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D004269:DNA, Bacterial / Q000502:physiology; D004352:Drug Resistance, Microbial; D006090:Gram-Negative Bacteria / Q000187:drug effects* / Q000235:genetics; D011815:R Factors
chemical_list: D000900:Anti-Bacterial Agents; D004269:DNA, Bacterial