Published online by Cambridge University Press: 29 January 2018
Greiner and Nicolson (1965) put forward the hypothesis that schizophrenia was associated with a state of increased melanogenesis which they attributed to a biochemical defect in the pineal gland. Isolated literature reports had documented the occurrence of hyperpigmentation in schizophrenia. These observations might be relevant, as the neurone and melanocyte have common features: both are ultimately derived from the neural plate; both require tyrosine as precursor in the biosynthesis of their specific products (catecholamines and melanin respectively); and many neurocutaneous diseases show coexistent neuropsychiatric and pigmentary disorder.
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