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Definition: plasmids carrying genes responsible for antibiotic (or antibacterial drug) resistance among bacteria (notably Enterobacteriaceae); they may be conjugative or nonconjugative, the former possessing transfer genes (resistance transfer factor), which are lacking in the latter.
Synonym(s): R factors, R plasmids, resistance factors, resistance-transferring episomes
Examples: glitazone, GI cocktail, etc.
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