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(a) Competition between PA138 (•) and PA147-2lacZY (○). PA138 was inoculated as a 1:250 minority population. Despite the low initial inoculum, PA138 was able to outcompete PA147-2lacZY. (b) PA147-2lacZY was inoculated as a 1:150 minority in competition with PA147-2. Unlike the GASP mutant (PA138), PA147-2lacZY is unable to increase its relative representation in the population.
