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. Author manuscript; available in PMC: 2010 Mar 14.
Published in final edited form as: J Pineal Res. 2009 Jun 17;47(1):75–81. doi: 10.1111/j.1600-079X.2009.00690.x

Fig. 1.

Fig. 1

Onset of melatonin secretion is much earlier in degus than in rats. Melatonin secretion was monitored in degus (red dots, n = 3), Sprague Dawley (SD) rats (purple dots, n = 5), and Wistar rats (green dots, n = 8) using pineal microdialysis, and normalized to daily maximum levels. The dashed line represents 20% of the maximum levels. Animals were housed in LD12:12 hr with lights-off at 18:00 hr. Compared with rats, degus clearly display advanced onset of melatonin secretion.