Dictionary of Biological Psychology
A protein that catalyses chemical reactions (typically in the presence of other substances that are necessary for the reaction to occur): see CATALYST.
Enzymes are involved in both the synthesis and degradation of chemicals. For example, GLUTAMIC ACID DECARBOXYLASE is an enzyme that catalyses the conversion of glutamate to GABA; ACETYLCHOLINESTERASE is an enzyme involved in the breakdown of acetylcholine.
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