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Craft, R M; Dykstra, L A (1993) Morphine antagonizes U50,488's effects in a squirrel monkey shock titration procedure. Eur J Pharmacol 234:199-207
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Craft, R M; Dykstra, L A (1992) Agonist and antagonist activity of kappa opioids in the squirrel monkey: II. Effect of chronic morphine treatment. J Pharmacol Exp Ther 260:334-42
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Craft, R M; Dykstra, L A (1992) Agonist and antagonist activity of kappa opioids in the squirrel monkey: I. Antinociception and urine output. J Pharmacol Exp Ther 260:327-33
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Doty, P; Dysktra, L A; Picker, M J (1992) Delta 9-tetrahydrocannabinol interactions with phencyclidine and ethanol: effects on accuracy and rate of responding. Pharmacol Biochem Behav 43:61-70
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Negus, S S; Picker, M J; Dykstra, L A (1991) Interactions between the discriminative stimulus effects of mu and kappa opioid agonists in the squirrel monkey. J Pharmacol Exp Ther 256:149-58
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Craft, R M; Dykstra, L A (1990) Differential cross-tolerance to opioids in squirrel monkeys responding under a shock titration schedule. J Pharmacol Exp Ther 252:945-52
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Dykstra, L A; Picker, M J; Powell, K R (1990) Opioid agonists/antagonists in morphine-tolerant squirrel monkeys. Pharmacol Biochem Behav 36:639-44
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Dykstra, L A (1990) Butorphanol, levallorphan, nalbuphine and nalorphine as antagonists in the squirrel monkey. J Pharmacol Exp Ther 254:245-52
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