Normalized total13C-enrichment (1-unlabeled) of UMP across fetal tissues. For each fetal tissue sample, the nucleotide-labeled pool (1-unlabeled) was normalized to its respective total13C-enrichment (1-unlabeled) of glucose from maternal plasma. Data are individual points and mean SEM. Statistical analyses were performed using multiple two-tailed t tests with Holm-Sidak’s multiple-comparisons adjustment.
