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The local structure of dragline silk from the spider Nephila madagascariensis is investigated by solid-state nuclear magnetic resonance. ... The microstructure of the glycine-rich domains is found to be ordered. The simplest model that explains the experimental findings is a 3(1)-helical structure. ... This observation may help to explain the extraordinary mechanical properties of this silk, because 3(1)-helices can form interhelix hydrogen bonds. 30
