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Stk is required for full penicillin tolerance in GAS. Percent survival, measured by colony counts, is presented for MGAS2221 (wild type), JRS2516 (its Δstk derivative), and JRS7322 (Δstk::stk mutant). Vertical bars indicate the range of values in at least 5 separate experiments. Nonparametric statistics (Wilcoxon test) were used to calculate P values.
