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Extracellular contractile injection systems (eCISs) are phage-derived nanomachines used by bacteria to deliver effectors into target cells. Well-studied examples include the Photorhabdus asymbiotica virulence cassettes and the antifeeding prophage from Serratia entomophila, which have been engineered for heterologous cargo delivery. Recent genomic analyses identified previously uncharacterized eCI
