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Proposed model for the prolactin rhythm initiated by cervical stimulation (CS) or by oxytocin (OT) injection. Closed arrowheads indicate stimulatory actions, open arrowheads indicate inhibitory actions. The stimulation of dopamine (DA) neurons by prolactin (PRL) has a delay of τ hours. A pulse of vasoactive intestinal polypeptide (VIP) from suprachiasmatic neurons occurs every morning, setting the phase of the prolactin oscillation. The memory, M, is switched on by CS or by PRL.
