Figure 5: Fractional contribution of glutamine carbon to TCA cycle intermediates, calculated from the corrected mass isotopomer distributions at 24 h during growth (mock infection) conditions (sumi(Mi × i)/number of carbon atoms in metabolite).
From: Metabolic flux profiling of MDCK cells during growth and canine adenovirus vector production

Values were normalized by the 13C enrichment in extracellular glutamine using the same equation. Arrows indicate that isotopic steady-state has not been reached.