Two recent papers provide evidence that the Escherichia coli RecBCD complex, which unwinds double-stranded DNA to supply a substrate for recombination, has two helicase subunits that bind opposite DNA strands and move with opposite unwinding 'polarities'.
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Matson, S. Dual engines moving on antiparallel tracks. Nat Struct Mol Biol 10, 499–500 (2003). https://doi.org/10.1038/nsb0703-499
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DOI: https://doi.org/10.1038/nsb0703-499