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Example for building a gene-protein-reaction model using the enzyme pseudo-coding numbers. (A) Three reactions and their gene associations. (B) Reduced gene associations and encoded genes of the enzyme. E2 is a redundant enzyme that is identical to E1 and catalyzed the same reactions. r2 is catalyzed by the isozymes (E1 and E3). E1 is encoded by G1, and E3 is encoded by a complex of G3 and G4.
