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Table representation of search results timeline featuring number of search results per year.

Year Number of Results
1974 1
1976 23
1977 70
1978 109
1979 138
1980 193
1981 230
1982 299
1983 318
1984 373
1985 360
1986 438
1987 393
1988 424
1989 403
1990 526
1991 404
1992 398
1993 449
1994 419
1995 407
1996 409
1997 445
1998 447
1999 465
2000 540
2001 518
2002 476
2003 567
2004 522
2005 533
2006 566
2007 529
2008 586
2009 595
2010 561
2011 620
2012 672
2013 646
2014 578
2015 625
2016 535
2017 535
2018 501
2019 486
2020 533
2021 416
2022 247
2023 185
2024 48

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19,252 results

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Page 1
Opioid receptors: drivers to addiction?
Darcq E, Kieffer BL. Darcq E, et al. Nat Rev Neurosci. 2018 Aug;19(8):499-514. doi: 10.1038/s41583-018-0028-x. Nat Rev Neurosci. 2018. PMID: 29934561 Review.
Delta Opioid Receptors: Learning and Motivation.
Pellissier LP, Pujol CN, Becker JAJ, Le Merrer J. Pellissier LP, et al. Handb Exp Pharmacol. 2018;247:227-260. doi: 10.1007/164_2016_89. Handb Exp Pharmacol. 2018. PMID: 28035528 Free article. Review.
Kappa-opioid receptors and analgesia.
Millan MJ. Millan MJ. Trends Pharmacol Sci. 1990 Feb;11(2):70-6. doi: 10.1016/0165-6147(90)90321-x. Trends Pharmacol Sci. 1990. PMID: 2156363 Review.
19,252 results
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