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TARAPACKI, J. A., M. PIECH AND M.B. KRISTAL. Ingestion of amniotic fluid by postpartum rats enhances morphine antinociception without liability to maternal behavior. PHYSIOL BEHAV 57(2) 209-212, 1995.--Ingestion of amniotic fluid or placenta by rats has been shown to enhance opioid-mediated analgesia induced by morphine injection, foot shock, vaginal/cervical stimulation, or late pregnancy. The...
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