Superpathway of sulfur amino acid biosynthesis. Near each enzyme (gene product) is a bar representing the regression weights of the six significant cultivation parameters. These parameters are stated in the legend in the upper-left corner of this figure. A blank box indicates that the cultivation parameter is not selected by the regression model. Red and green boxes indicate positive (upregulation) and negative (downregulation) regression weights, respectively. Darker colors indicate larger regression weights.