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Growth curves for E. faecalis R703 with erm(Bv). The strain was induced with 0.1 μg of tylosin per ml (A) and 0.1 μg of erythromycin per ml (B) for 0 (solid circles), 15 (solid squares), 60 (solid triangles), and 120 (solid diamonds) min. The cultures were then challenged with 500 μg of erythromycin per ml for 6 h.
