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Plasma PRL concentrations (mean ± SEM) in samples obtained from animals given three infusions of EAA (15 μm) or PBS 6 d previously. PRL levels were low during the intersurge period (1:00 A.M.), whereas only EAA-infused animals showed increased PRL levels at the time of the nocturnal surge (7:00 A.M.). The numbers in parentheses are the numbers of animals per group. *Significantly higher than all other times and treatments (p ≤ 0.001).
