OtherNEUROPHARMACOLOGY
The Entry of [d-Penicillamine2,5]Enkephalin into the Central Nervous System: Saturation Kinetics and Specificity
Sarah A. Thomas, Thomas J. Abbruscato, Victor J. Hruby and Thomas P. Davis
Journal of Pharmacology and Experimental Therapeutics March 1997, 280 (3) 1235-1240;