Compounds that show significant changes in abundance between nutrients. (a). Colours indicate the log. ratio of the abundance in one nutrient compared to the overall mean. Only compounds with a more than two-fold change in abundance in at least one condition relative to the mean are shown. Other details are the same as Figure 1. The same compounds are shown in a simplified metabolic network in (b) connected to their cognate enzymes. Colours in each node represent the fold change in the measured metabolite (more than two-fold) or protein (>1.25-fold) abundances. Nodes referred to in the text are highlighted and numbered.