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. 2014 Dec 12;8(Suppl 5):S4. doi: 10.1186/1752-0509-8-S5-S4

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Copyright © 2014 Sriyudthsak et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Examples for typical metabolic pathways and U-system approach. a Simple linear pathway. A, B, and C represent metabolites. b Diagram for constructing a mathematical model using U-system approach. c Branched pathway with inhibition (⊕) and activation (⊖). X_i(i=1, 2, 3 and 4) represent metabolites.