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Carbon-13 isotopic labeling of B. mori silk fibroin was achieved biosynthetically with [1- 13 C] glycine in order to determine the carbonyl bond orientation angle of glycine sites with the silk fibroin. Angular dependence of 13 C solid state NMR spectra of uniaxially oriented silk fibroin fiber block sample due to the carbonyl 13 C chemical shift anisotropy...
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