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. 2006 Nov 28;7:517. doi: 10.1186/1471-2105-7-517

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Copyright © 2006 Ott and Vriend; 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/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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The biosynthesis of 6,7-dimethyl-8-(1-D-ribityl)-lumazine from 5-amino-6-(5-phosphoribitylamino)uracil and D-ribose 5-phosphate in KEGG and in BioMeta. Reaction entry R04457 from KEGG is shown with the problems indicated, including the product being shown on the left-hand side. The carbon and phosphorus imbalance causes the reaction to be unbalanced in oxygen and hydrogen as well. In BioMeta three reaction steps have been added to correctly represent this chemistry. Note that the reaction from D-ribose 5-phosphate to D-ribulose 5-phosphate (the reactant of MR005453) was already present in the database.