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Frequencies of transfer of antibiotic resistance genes from STEC 6-20 to MG1655 in storm water with pH values of 5, 6, 7, and 8 at 28°C. (a) Transconjugants selected on SMAC supplemented with oxytetracycline. (b) Transconjugants selected on SMAC supplemented with tetracycline.
