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McLaughlin, P. J., S. W. Tobias, C. M. Lang and I. S. Zagon. Chronic exposure to the opioid antagonist naltrexone during pregnancy: Maternal and offspring effects. Physiol Behav 62(3) 501-508, 1997.-The role of endogenous opioids in pregnancy and parturition, and the influence exerted on prenatal and postnatal features of the offspring, were studied in rats. Females received daily injections of 50...