Figure 4: Agonist analysis by PCA. (a) PCA scores plots for various concentration of glutamate and 2mM AMPA (Gs) and 2mM kainate (Hs) are combined. (b) PCA plots for only low and middle concentration glutamate and kainate are combined. The area on the clustered PCA plots of Glu samples is indicated by a dotted line and the area of agonist (AMPA, kainate) is indicated by solid line.