RT Journal Article SR Electronic T1 SITES AND MECHANISMS OF ACTION OF MORPHINE AND RELATED DRUGS IN THE CENTRAL NERVOUS SYSTEM JF Pharmacological Reviews JO Pharmacol Rev FD American Society for Pharmacology and Experimental Therapeutics SP 435 OP 506 VO 2 IS 3 A1 ABRAHAM WIKLER YR 1950 UL http://pharmrev.aspetjournals.org/content/2/3/435.abstract AB