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Anna Dragoš (Technical University of Denmark) and colleagues published a new paper in Current Biology on how phages carry interbacterial weapons encoded by biosynthetic gene clusters. They investigated phage-encoded Biosynthetic Gene Clusters (BGCs), challenging the relationship between phage origin and BGC structure and function. They found BGCs in temperate phages that infect certain human-associated bacteria, with almost all phage BGCs being bacteriocins. Some BGCs provide a competitive fitness advantage for lysogenized hosts.