Repair enzymes must communicate across hundreds of nucleotides to undo errors made during DNA replication. Imaging reveals that the enzymes do this by forming a series of ring-like clamps that diffuse along the DNA. See Letter p.583
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Kad, N., Van Houten, B. Clamping down on copy errors. Nature 539, 498–499 (2016). https://doi.org/10.1038/nature20475