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I27 module distortion at an extension of 17 Å. Hydrogen bond pairs between β-strand A and B as well as A′ and G (dashed lines) clearly are stretched beyond their breakage. In comparison, hydrogen bonds between strand F and G (dotted lines) remain close to their equilibrium value. Strands A and A′ are displayed in a different gray scale because both are the first to be separated from the module on forced unfolding. The single force peak for I27 occurs at 14.2 Å (12).
