13C-NMR signals of C-2β of Glc isolated from starch. A through C, simulated signals of isotopomers a, d, and e, respectively; D, sum of the simulated signals scaled according to the molar fractions of isotopomers in the experiment with [U-13C6]Glc (compare with Table III); E, signal of the biosynthetic sample from the experiment with experiment with [U-13C6]Glc.