Systems Biotechnology: Combined in Silico and Omics Analyses for the Improvement of Microorganisms for Industrial Applications - Systems Biology: Networks, Models, and Applications - page 206

Figure 7.5 Two approaches for flux interpretation using the 13 C labeling patterns of metabolites [33]. The 13 C-labeled carbon substrate
is used for the quantification of the relative amounts of the differently labeled metabolites. GC/MS and NMR can be used for
determining isotopomer distribution.