However these enzymes are structurally and mechanistically different. Although these two enzymes perform similar functions, they are structurally and mechanistically different. Some evidence indicates sound production in hardhead catfish is differentiated both mechanistically and contextually. Several different kinds of cellulases are known, which differ structurally and mechanistically. I-V, and is especially closely structurally and mechanistically related to eukaryotic nuclear RNAP II. Chloroplast also contain a second, structurally and mechanistically unrelated, single-subunit RNAP ("nucleus-encoded polymerase, NEP"). This cleavage is very similar mechanistically to the aldolase A reaction of glycolysis. DD-transpeptidase is mechanistically similar to the proteolytic reactions of the trypsin protein family. These include dual catalytic approaches, reactions involving other metals, and mechanistically distinct palladium-catalyzed methods. However, mechanistically speaking, biocatalysis is simply a special case of heterogeneous catalysis. Thus, the reaction pathways are mechanistically isolobal. Even so, their several individual numbers are done too slickly, too mechanistically. The process is mechanistically similar to the hydrogenation of alkenes. It is thought to be mechanistically similar to the related enzyme histidine ammonia-lyase (EC&colon;4.3.1.3, HAL). A proposed reaction mechanism for the removal of parabens by ozonation is detailed mechanistically.