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Using synchrotron radiation and the small-angle X-ray scattering technique we have measured the radii of gyration of a series of alanine-based α-helix-forming peptides of the composition Ace-(AAKAA) n -GY-NH 2 , n=2–7, in aqueous solvent at 10(±1)°C. In contrast to other techniques typically used to study α-helices in isolation (such as nuclear magnetic resonance and circular dichroism),...
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