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The 13C-15N dipolar splitting was observed for the oriented [1-13C]glycine-[15N]alanine Bombyx mori silk fibroin rods placed parallel to the magnetic field with 15N solid state NMR spectroscopy. The isotope labeled and oriented silk fibroin samples were prepared by the cultivation of the middle silkgland from the silkworm. The angle between the 13C-15N peptide bond of the glycine-alanine sequence and the oriented axis was determined as 141° from the coupling constant.
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Asakura et al. (1994) studied this question.
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