R plasmid, R factor
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R plasmid, R factoror
resistance factora transferable PLASMID of many bacteria that carries genes for resistance to antibiotics or other antimicrobial agents. It is often associated with a transfer factor, which after conjugation results in the transfer of the R plasmid to another bacterium.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005