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Estimated fitness, w, of com+ (BD630) in pairwise competition with com− (BD2121). Control: competence medium w = 0.84 ± 0.06 (mean and 95% confidence interval for nine independent replicas). PenG: 2-hr pulse of penicillin G, w = 1.04 ± 0.06. LB: w = 1.03 ± 0.02. **P < 0.001, PenG vs. control and LB vs. control.
