Mixture of Rectangular and Staggered Packing Arrangements of Polyalanine Region in Spider Dragline Silk in Dry and Hydrated States As Revealed by 13C NMR and X-ray Diffraction. - Tetsuo Asakura; Yugo Tasei; Akihiro Aoki; Akio Nishimura (Macromolecules, 2018)