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Tags: 1992, Ala(2)-MePhe(4)-Gly(5)-, Analgesics/*pharmacology, Analysis of Variance, Animals, Brain research, Calcagnetti D J, Crisp T, Drug Synergism, Enkephalin, Enkephalins/*pharmacology, Injections, Male, Pain Measurement, Physical, Physiological/*physiopathology, Rats, Reaction Time, Restraint, Spinal, Sprague-Dawley, Stafinsky J L, Stress
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