Fig. 5. Inter-school variations in the PC profile. (A–D) HPLC chromatogram of PC obtained from four schools showed a heterogeneous PC profile, particularly the peaks in the boxed frames. (E) The two leading principal components (PC1 and PC2) were projected into 2D space. Each dot indicates the schools that were plotted without any characteristic distribution pattern. (F) Comparison of PC profiles by representing a matrix of correlation coefficients that indicate the degree of overall similarity. Black colors indicate lower correlations.