Choroid plexus is an additional source of melatonin in the brain.
Quintela T, Gonçalves I, Silva M, Duarte AC, Guedes P, Andrade K, Freitas F, Talhada D, Albuquerque T, Tavares S, Passarinha LA, Cipolla-Neto J, Santos CRA.
Quintela T, et al.
J Pineal Res. 2018 Nov;65(4):e12528. doi: 10.1111/jpi.12528.
J Pineal Res. 2018.
PMID: 30260503