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• Increased levels of enkephalin following natural sunlight (combined with salt water bathing at the Dead Sea) and ultraviolet A irradiation.

  Authors: Nissen JB, Avrach WW, Hansen ES, Stengaard-Pedersen K, Kragballe K Source: Br J Dermatol. 1998 Dec;139(6):1012-9. DOI: 10.1046/j.1365-2133.1998.02557.x Language: English Availability: abstract

• Circulating opioid peptides during water immersion in normal man.

  Authors: Coruzzi P, Ravanetti C, Musiari L, Biggi A, Vescovi PP, Novarini A Source: Clin Sci (Lond). 1988 Feb;74(2):133-6. DOI: 10.1042/cs0740133 Language: English Availability: full text