Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         "crystal-kingdom"
           chemical substances
             chemical compounds
               Class amides [RkE(=O)l(OH)m (l≠0; ≥1 (OH):=(NR2))]
                 Class peptides [H2NCH(R)C(=O)[NHCH(R)C(=O)]nOH]
                   Class polypeptides
                     Class proteins
                       Class globular proteins
                         "enzymes"
                           2,3-bisphosphoglycerate phosphatase
                           acetylcholinesterase
                           aconitase
                           adenylate cyclase
                           aldolase
                           amylase
                           β-galactosidase
                           bisphosphoglycerate mutase
                           carbonic anhydrase
                           carboxypeptidase
                           chymotrypsin
                           citrate synthase
                           dehydrogenases
                           formic hydrogenlyase
                           fumarase
                           galactose 1-phosphate uridyl transferase
                           kinases
                           lipase
                           nitrogenase
                           pepsin
                           phosphoglucomutase
                           phosphoglucose isomerase
                           phosphoglyceromutase
                           rennin
                           ribulose bisphosphate carboxylase
                           salivary amylase
                           succinyl CoA synthetase
                           triose phosphate isomerase
                           trypsin
                           UDP-galactose-4-epimerase