Figure 5.

Melatonin levels ± SEM measured in pineal explants obtained from neonatal rats at 5, 7, and 9 days of age (n = five cultures for each treatment). Melatonin levels were measured at the end of a 6-h period of stimulation with 10 μM NE, during which the explants were exposed either to light (open bars) or dark (solid bars). There were no significant differences between the light- and dark-exposed cultures.