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Time: 2024-03-29T01:31:35Z
URL: http://scholar.google.com/scholar_lookup?title=Hypoalgesia+elicited+by+a+conditioned+stimulus+is+blocked+by+a+mu%2C+but+not+a+delta+or+a+kappa%2C+opioid+antagonist+injected+into+the+rostral+ventromedial+medulla.&year=1999&author=Foo&journal=Pain.&volume=83&issue=3&pages=427-431&pmid=10568850