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OTR-A (20 ng/0.4 μl) infused into the VMHvl blocked the N-PRL surge in correctly placed, cycling females. Blood was collected at N-PRL surge time, 1900 h, 6 d after mating. Two females that were PSP in the correctly placed OTR-A infusion group are not included in this figure. *, P ≤ 0.05 comparisons with aCSF and OTR-A missed (Miss) groups.
