Frequency patterns of six enzyme categories and five metabolic pathways. Probe-set frequency pattern and correlation coefficient of: (a) EC Level 1 protein collectives (EC1: oxidoreductases, EC2: transferases, EC3: hydrolases, EC4: lyases, EC5: isomerases, and EC6: ligases); and (b) five common metabolic pathways (P1: carbohydrate metabolism, P2: energy metabolism, P3: lipid metabolism, P4: nucleotide metabolism, and P5: amino acid metabolism). The probe-set frequencies are normalized and represented by the gradient color in the frequency patterns, shown by the half circles. The inner tracks of the circles represent probe names, and the color cells of the outer tracks represent the normalized probe-set frequency values. The table in each panel respectively records the correlation coefficients between the protein collectives. In this figure, probes with zero frequency values are omitted.