FIG. 3.

The G_II alleles confer a competitive advantage to G_I cells. A 1-day-old culture of the G_I mutant (ZK2552) (●) was mixed 1:1 with a 1-day-old culture of the G_II strain (ZK2555) (A), the G_I sgaA strain (ZK2561) (B), the G_I sgaB strain (ZK2559) (C), or the G_I sgaC strain (ZK2563) (□) (D). Asterisks indicate that viable counts fell below detectable levels (<10³ CFU/ml). The patterns of GASP takeovers were identical in six replicate mixtures, including ones where the selectable markers were switched between the competing strains.