This enzyme catalyses isomerization between fumarate and maleate. Lipase is a digestive enzyme that catalyses the hydrolysis of lipids (fats). This is because sodium bisulfate catalyses deamination of unmethylated cytosine to uracil. The nickel-containing enzyme carbon monoxide dehydrogenase catalyses this process. The oxidative enzyme catalyses the formation of monolignol radicals. In the , proline catalyses an asymmetric aldol reaction. The enzyme catalyses the oxidation of firefly luciferin, requiring oxygen and ATP. This enzyme catalyses the following reversible chemical reaction. Horseradish peroxidase catalyses the oxidation of luminol to 3-aminophthalate via several intermediates. Amylase () is an enzyme that catalyses the hydrolysis of starch (Latin ) into sugars. Adenosine phosphate-isopentenyltransferase (IPT) catalyses the first reaction in the biosynthesis of isoprene cytokinins. MTO catalyses for the oxidations with hydrogen peroxide. MTO also catalyses the conversion of aldehydes and diazoalkanes into an alkene. Polyphenol oxidase (PPO) is an enzyme that catalyses the oxidation of o-diphenols to produce o-quinones. In addition, the availability of cellular iron catalyses redox reactions and further generates ROS.