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. 2013 Nov 21;7:131. doi: 10.1186/1752-0509-7-131

Figure 1.

Figure 1

The end-product module with gene-expression and metabolic regulation.x1, x2, …, xn represent the concentrations of metabolites in the pathway; E1, E2, … are the concentrations of enzymes catalysing each reaction. For illustration, only the enzyme of the first reaction (E1) is assumed negatively regulated via both metabolic (allosteric) effect and gene-expression regulation through the end product xn.