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. Author manuscript; available in PMC: 2010 Dec 1.
Published in final edited form as: Rev Endocr Metab Disord. 2009 Dec;10(4):237–243. doi: 10.1007/s11154-009-9125-5

Fig. 1.

Fig. 1

Secretion profiles of 5-HT, NAS and melatonin from pineal microdialysis of a rat. All three compounds display marked circadian rhythms in both light and dark (LD) and constant dark (DD) conditions with nocturnal increase in secretion