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Tryptophan hydroxylase 2 (TPH2) encodes the rate-limiting enzyme for brain serotonin biosynthesis. It was recently reported that the TPH2 haplotype was linked to depression in humans.

archives of general psychiatry

Haplotype-Based Linkage of Tryptophan Hydroxylase 2 to Suicide Attempt, Major Depression, and Cerebrospinal Fluid 5-Hydroxyindoleacetic Acid in 4 Populations