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Outcomes of the mini-CRISPR array-mediated virus arms race in the case of two lytic viruses, whose productivity in mixed coinfections is half of their productivity in a pure, single infection. Each virus will maintain mini-CRISPR arrays targeting the other virus if the probability of coinfection is greater than twice the cost of the array. Viruses A and B are represented in yellow and blue, respectively. Black borders denote the presence of a mini-CRISPR array.
