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Nicholas Swanson (Thomas Jefferson University, USA) and colleagues published a paper in Molecular Cell on the cryo-EM structure of the periplasmic tunnel of the T7 DNA-ejectosome. They reconstituted the phage T7 DNA-ejectosome components and solved the periplasmic tunnel structure. They found that the complex lacks channel-forming activity, suggesting that the pore for DNA passage forms only transiently during genome ejection.