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Extension-force curves for the P5ab, P5abcΔA, and P5abc molecules in the constant force ensemble. The foldings and unfoldings for the P5ab and P5abcΔA under the constant force are all or none around the transitions 13.3 pN and 11.3 pN, respectively, whereas the extension-force curve for the P5abc has an intermediate between 8.0 and 11.0 pN. The symbols are the results from the Monte Carlo simulation, and the lines are obtained from exact numerical calculation.
