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Melatonin levels ± SEM measured in dispersed pineal cell cultures (n = 10–12 cultures for each day). Cultures were obtained from postnatal day 1 rats and were maintained for 3, 5, 7, 9, 11, and 18 days before stimulation with NE. Melatonin levels were measured at the end of a 6-h period of stimulation with 10 μM of NE.
