Transposons.
D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D004247:DNA; D004352:Drug Resistance, Microbial; D004755:Enterobacteriaceae / Q000187:drug effects; D005111:Extrachromosomal Inheritance; D010957:Plasmids; D011815:R Factors
D000900:Anti-Bacterial Agents; D004247:DNA