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. Author manuscript; available in PMC: 2022 May 1.
Published in final edited form as: Mass Spectrom Rev. 2020 Jul 1;40(3):280–305. doi: 10.1002/mas.21642

FIGURE 4.

FIGURE 4.

A qualitative folding landscape for PPI/PPII transitions for Pro13 in vacuo. system. The barrier height is estimated from collision voltages rather than more accurate solution phase measurements or well-defined single collision energies. Note that the reaction D→C varies with H2O and is highest for a “dry” environment. Adapted from Shi et al. (2016b).