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Colicins are a diverse family of large antibacterial protein toxins, secreted by and active against Escherichia coli and must cross their target cell's outer membrane barrier to kill. To achieve this, most colicins require an abundant porin (e.g. OmpF) plus a low-copy-number, high-affinity, outer membrane protein receptor (e.g. BtuB). Recently, genetic(More)
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