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Predatory bacteria kill other bacteria for nutrients. Contact-dependent predation requires direct contact between predator and prey. Structural, genetic, and imaging evidence show the roles of envelope protein machineries like pili and secretion systems. Adhesins and specialized membrane junctions also play a part. These elements mediate key steps in predation. Detailed understanding is limited, but patterns show molecular devices are repurposed and regulated for predation. Future research should identify the molecular nature of prey-predator interfaces. It should also explore how prey contact and consumption integrate with other processes. This could reveal new bacterial cell cycle control pa…