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The frequency of the SAR strain in competition experiments against the ampsens1 strain (diamonds, n=8 replicates) and against the ampsens2 strain (squares, n=2 replicates). These competition experiments were carried out in the presence of ampicillin. On day 1, strains were initialized at a frequency of 0.5. Differences were found to be significant on days 4 and 5 only.
