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Two blocks of high sequence similarity locate to the 5' and 3' end of tipC genes, and we found strong evidence for recombination between tipC paralogues encoded by Streptococcus mitis BCC08. By contrast, we found only a single homology block across tsaI genes, and little evidence for intergenic recombination within this gene family. We conclude that homologous recombination is one of the drivers for the evolution of T7SS immunity gene clusters.Zea mays (maize) makes phytoalexins such as sesquiterpenoid zealexins, to combat invading path