The numbers in parenthesis indicates that number of QSAR in each sub-class. Table 2: Class Codes--Biological Database {Number of sets in parentheses}* BO Unknown (9) B1 Nonenzymatic Macromolecules (DNA, Fibrin, Hemoglobin, Soil, Albumin, etc.) (286) B2 Enzymes B2A Oxidoreductases (812) ...