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Average isotopolog composition of 13C-labelled ribose units in ribonucleosides from S. frugiperda cells grown with a 1:99 mixture of [U-13C6]glucose and unlabelled glucose added to SF-900 II medium. Bold lines indicate isotopologs with adjacent 13C-labelled carbon atoms that were transferred from the same molecule of [U-13C6]glucose. The numbers give the molar contributions of the indicated isotopologs.
