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Relationship between the 13C enrichment (percentage) in C-atom positions in fumarate and the symmetrical C-atom positions in succinate (i.e. C-2 + C-3 and C-1 + C-4). Only data in which one of these two metabolites was labeled (13C > 1.1%) are shown. Black circles, H2O conditions; white circles, D2O conditions. Pyr, Pyruvate.
