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Oxytocin (OT) and vasopressin (VP) are synthesized and secreted by the paraventricular hypothalamic nucleus (PVN), and both peptides have been implicated in the pain modulatory system. In the spinal cord, activation of OT-containing axons modulates nociceptive neuronal responses in dorsal horn neurons; however, it is not known whether the direct VPergic descending projection participates. Here, we...