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. 2017 May 31;6(6):R87–R98. doi: 10.1530/EC-17-0071

Figure 1.

Figure 1

l-Tryptophan is metabolised by tryptophan hydroxylase, a rate-limiting step for serotonin synthesis. Monoamine oxidase occurs at 2 subtypes MAO-A and MAO-B with a widespread occurrence in the brain and in the periphery. They show differences in substrate specificities and sensitivities to inhibitors.