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Structure of the ssDNA binding site in substrate and product complexes of PcrA helicase. (Left) A ribbon representation of the two complexes with the inset at higher magnification. The protein backbone is white with amino acid residues, which contact ssDNA color-coded according to the cartoon representation (Right). The partial duplex DNA substrate that is bound to PcrA in both complexes is orange. In the product complex an area of duplex DNA is disordered and has not been modeled.
