Running a principal component analysis on the peaks extracted from the electropherograms, we obtain the score plot shown in the top half of Figure . We can observe that each sample set is well clustered, and that the first component captures the largest part of the inflammatory triggers' effect on the metabolic status of the astrocytes, distinguishing all three treatments from the control group. Additionally, the second component finds an effect separating the TNFα from the other two groups (IL-1β and LPS), which remain clustered together.