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(a–d) Results of SMD simulations showing the free-energy landscape of unzipping obtained by pulling the tip of a single strand (a and b) along the helix axis and (c and d) normal to the helix axis. The primary axes of plots a and c depict the energy, and the secondary axes illustrate the number of backbone hydrogen bonds (Hbonds) of the pulled strand. Panels b and d show snapshots of the coiled coil throughout the simulations. To see this figure in color, go online.
