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Proposed model of α-β transition, revised after Ref. [9]. Regions of coiled-coil irregularity, such as stutter or stammer, and the ends of pre-existing intra-chain β-sheets can both serve as stress concentration points where extension and unraveling of coiled-coils occur to form new β-sheets during uniaxial tension. (Coiled-coils are assumed to be dimeric for the purpose of this illustration.)
