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Extension versus time traces of the P5ab molecule at constant forces in equilibrium: (a) the dynamics proposed by us and (b) the fork dynamics proposed by Cocco et al. (2003). The frequency distributions of the lifetimes of the single strand and hairpin states: (c) the dynamics proposed by us and (d) the fork dynamics. The average lifetimes of the two states in simulations can be obtained by fitting to exponential functions.
