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Various alanine-rich α-helices and the corresponding intrapeptide 310-helical (top), α-helical (middle), and π-helical (bottom) bonding profiles of 100 trajectories at 1 Å/ns. Most of the hydrogen bonds are formed as i → i + 4, and the rate of losing α-hydrogen bonds is about the same, which is determined to be −0.63 H bond/Å. To see this figure in color, go online.
