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1. ACholine kinase, which phosphorylates choline to phosphocholine for membrane phospholipid synthesis
2. BMonoamine oxidase-B, which metabolises monoamines such as dopamine and tyramine in the central nervous system
3. CCholine acetyltransferase (ChAT), the cytoplasmic enzyme transferring an acetyl group onto choline
4. DButyrylcholinesterase, the liver-derived plasma cholinesterase that also hydrolyses esters such as succinylcholine
5. EAcetylcholinesterase, the synaptic enzyme that hydrolyses acetylcholine back into choline and acetate