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Transformation of the wild type (LT11) and the comC (SM001), comE (SM016), and comD (SM003) mutants in the absence or presence of 1 μM SCSP. Transformants were selected on THB agar containing the selective antibiotic erythromycin, after exposure of 1 ml of culture cells to 1 μg of pVA838. The results for the comGB (SM015) and comX (SM017) mutants are not shown since transformation was completely abolished. The results are mean values and standard errors from two independent experiments.
