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Cyclization free energy profile (PMF) for a typical pair of sequences tested, showing a peptide that cyclizes readily (18, red) and one that does not cyclize (17, blue). The 4 Å threshold that defines the separation of the termini in the PCC is shown by the gray line. In the native state of the peptide 18 its termini are close to each other. This is not the case for the peptide 17, which needs to overcome 20 kJ mol–1 barriers to reach PCC.
