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From 2012.igem.org

Converted SBML xml file to GDX for use in GAMS, then adapted a GAMS script to run flux balance analysis (FBA) with a CO2 objective. Unfortunately the result was a null solution. So, now the task is to reduce the involved reactions until there is a correct result, then keeping adding reactions until the solution changes. In this way I should be able to identify the problem reactions.