What are the precursors to serotonin and how do they contribute to the production of this neurotransmitter in the brain?

Tryptophan and 5-hydroxytryptophan are precursors to serotonin. Tryptophan is converted into 5-hydroxytryptophan by the enzyme tryptophan hydroxylase, and then 5-hydroxytryptophan is further converted into serotonin by the enzyme aromatic amino acid decarboxylase. These precursors play a crucial role in the production of serotonin in the brain by serving as building blocks for the neurotransmitter.