Figure 2From: An analytic and systematic framework for estimating metabolic flux ratios from 13C tracer experimentsAn example of subpools of a metabolite pool. Phosphoenolpyruvate (PEP) is produced by two different reactions (ρ i and ρ j ), either from Oxaloacetate (OAA) or from glyceraldehyde 3-phosphate (GA3P). Thus, PEP has two in flow subpools, PEP from OAA and PEP from GA3P (grey boxes) that are mixed in the common PEP pool (at the bottom).Back to article page