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Linear pathway. Metabolic reaction steps of the threonine pathway from aspartate in Escherichia coli. The dependent variables, x1, x2, x3 and x4, respectively denote the concentrations of aspartyl-P, D, L-aspartic β-semialdehyde, homoserine and O-phospho-homoserine. The independent variables, x5, x6, x7, x8, x9 and x10 represent ATP, ADP, NADPH, NADP, aspartate, threonine and Pi, respectively. (The model is called chassagnole2 in JWS web site).
