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(原始内容存档于2011-09-05). Brownstein, M J. A brief history of opiates, opioidpeptides, and opioid receptors.. Proceedings of the National Academy of Sciences of
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Probable involvement of alpha(2C)-adrenoceptor subtype and endogenous opioidpeptides in the peripheral antinociceptive effect induced by xylazine. European