. . . . "The unfolding of alpha-helical and beta-sheet protein domains under load has two discrete transition states, each corresponding to a distinct fracture mechanism, rather than a transition state whose position moves continuously with pulling velocity." . "simulation-result" . . "Two discrete transition states govern protein domain unfolding" . "Theodor Ackbarow et al., “Hierarchies, multiple energy barriers, and robustness govern the fracture mechanics of α-helical and β-sheet protein domains”, Proceedings of the National Academy of Sciences 104, 16410-16415 (2007), doi:10.1073/pnas.0705759104; Abstract. Scope: Atomistic simulation of alpha-helical and beta-sheet domains over four orders of magnitude in pulling rate" . "Theodor Ackbarow, Xuefeng Chen, Sinan Keten, Markus J. Buehler. Hierarchies, multiple energy barriers, and robustness govern the fracture mechanics of α-helical and β-sheet protein domains. Proceedings of the National Academy of Sciences 104, 16410-16415 (2007). doi:10.1073/pnas.0705759104" . "Theodor Ackbarow, Xuefeng Chen, Sinan Keten, Markus J. Buehler" . "2007"^^ . "PMC2034213" . "doi:10.1073/pnas.0705759104" . "pmid:17925444" . "Hierarchies, multiple energy barriers, and robustness govern the fracture mechanics of α-helical and β-sheet protein domains" . . . "delphisci buehler-protein-materials claim extractor" . . . . "Claude Fable 5.1" . . . . . . . . . . . . "Quoted from the published abstract as returned by Europe PMC (2007-hierarchies.abstract.txt, sha256 4f052f4a8a9ddc7dfecc384493c31e0f00fcd9873ded36486b8618493fdf4e18); the full text was not read (not in Europe PMC open-access subset). Checked by build/check.py." . . . "We find that two discrete transition states corresponding to two fracture mechanisms exist." . . "4f052f4a8a9ddc7dfecc384493c31e0f00fcd9873ded36486b8618493fdf4e18" . "Checksum of the vendored text file inputs/2007-hierarchies.abstract.txt, not of the publisher's copy." . . . "Abstract of Hierarchies, multiple energy barriers, and robustness govern the fracture mechanics of α-helical and β-sheet protein domains, as read" . . "buehler-protein-materials" . "2026-11-08T04:38:11.893Z"^^ . . . . . "Theodor Ackbarow et al. 2007 claim: Two discrete transition states govern protein domain unfolding" . . "RSA" . "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAyFHtPB6p0mCjDozxlOY9CmO3nBm7Te3jFbXyLmM+G1tGe47Da0jYIbhkl9Oo1ZjxmCa3LCwlEqK8gj6hEIcL4ahW30JXh9HycfKVk1bugkzMEV15tJdTzAU3sGMFnbNsn43xY2LFLy45tApkRm5byEiM7oRRrooIdwoQKnP4Wzq/bfAoJ9qvW+MGkelyOTd1jbSt+KfmT7xKmDfWzAHddUlWwMX2QJOLxDaffOteTop6ZRgPiNmPJKA/S62Gac9XtSYT3oDkZ6/nr5cxxNLpOyxTf5FPISiCe11xYO/unYjY+mwnOfA8yhJIyx1l0O9I0vpOpn+E5TvyHJV+oSTrvwIDAQAB" . "T3raVuZjT7cNunj+5wCJGekrBrKz55PcP7vklL4b/8c6XZt0hhgHMAcozqrStEzrHkVnlF0AfCsESABNICcXbQt97vhAt1ouP5fqkSm7olA6Gn5FZtK1dLnAoEjHbATcePM0EajlJUx72GLp4wrre/aCNw8in5YxVN0q4JNnoXSaIcB/SMjlc7mZG2O+jrRkIiOUsi5Camka724rqN8v5vA0U/ZZ0sPhC8Z7+qXqvi+IttOutnHtfkzOmTbBvJFjc9N3iNBKsXQI2RBDnEyHB12yU6x2u33Ok+0K3o6AgnPvKcVErAo1FrAKaKHKVSwXWYPS1jJUGEhsw+j46pZO0w==" . . .