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Time: 2024-03-28T15:05:16Z
URL: http://scholar.google.com/scholar_lookup?title=Historical+review%3A+opioid+receptors&year=2003&author=Snyder&journal=Trends+Pharmacol+Sci&volume=24&issue=4&pages=198-205&doi=10.1016%2FS0165-6147%2803%2900066-X&pmid=12707007