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Temperate phage, Mixed presentation. Evolution of induction rate (ι2 for the mutant, ι1 for the wild type). (a) An increase in induction is favored under serial transfer, but selection is weak unless the wild-type induction rate is very low and the mutant rate is substantially higher. (b) Adding 107 wild-type lysogens per cycle weakens selection of the mutant (there are no useful contours when adding 108). Parameter values are as given in Fig. 5
