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nih.gov
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Stewart PE, Holper EM, Hammond DL (1994). "Delta antagonist and kappa agonist activity of Naltriben: evidence for differential kappa interaction with the delta 1 and delta 2 opioid receptor subtypes". Life Sciences. 55 (4): PL79-84. doi:10.1016/0024-3205(94)00738-1. PMID8028443.