Fig. 3

A PCA scatter plot generated from the 73 intracellular metabolites of S. cerevisiae strain EJ4 grown on four different carbon sources, glucose, galactose, xylose, or cellobiose, until the exponential growth phase. The labels in the PCA scatter plot represent the four different carbon sources with two different sampling timepoints, 1, mid-exponential phase; 2, late-exponential phase. All experiments were performed in five replicates