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Resonance-assisted hydrogen bonds at A8′(PS)T7′. (A) Hydrogen-bonding cascade (cyan lines) involving an α-helix of the protein and a presumed salt bridge (yellow lines). Distances for these interactions are shown in Å. The probable dipole moment for the α-helix is indicated on the left. (B) Possible resonance in the cascade provoking electron delocalization, where the negative charge at the C-terminus would be stabilized by a salt bridge.
