title: R plasmid R6-5 retains an active tet protein repressor gene.
mesh_terms: D004926:Escherichia coli / Q000235:genetics; D005809:Genes, Regulator; D009154:Mutation; D010641:Phenotype; D011815:R Factors; D013752:Tetracycline / Q000494:pharmacology*
chemical_list: D013752:Tetracycline