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Colonial morphology and GTase activity of S. oralis ATCC 10557 (A), and its erythromycin-resistant rgg-deficient (B) and kanamycin-resistant gtfR-deficient (C) mutants. GTase activity was determined by the synthesis of [14C]glucan from [glucose-14C]sucrose. Data are expressed as means ± standard deviations of triplicate experiments.
