Biologically Active Substance
R-factor
Subclass of:
Plasmids
Definitions related to r factors:
  • A class of plasmids in bacterial cells that promote resistance to agents such as antibiotics, metal ions, UV radiation, and bacteriophage.
    CRISP Thesaurus
    National Institutes of Health, 2006
  • A class of plasmids that transfer antibiotic resistance from one bacterium to another by conjugation.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
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