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Placental opioid-enhancing factor (POEF): generalizability of effects.
Abbott P, Thompson AC, Ferguson EJ, Doerr JC, Tarapacki JA, Kostyniak PJ, Syracuse JA, Cartonia DM, Kristal MB. Abbott P, et al. Among authors: doerr jc. Physiol Behav. 1991 Nov;50(5):933-40. doi: 10.1016/0031-9384(91)90417-m. Physiol Behav. 1991. PMID: 1666681
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