Cholecystokinin is necessary for the expression of morphine conditioned place preference.

Mitchell JM, Bergren LJ, Chen KS, Fields HL. Cholecystokinin is necessary for the expression of morphine conditioned place preference. Pharmacol Biochem Behav. 2006 Dec; 85(4):787-95.

2006
https://researcherprofiles.org/profile/1452673
17196636

Mitchell JM, Bergren LJ, Chen KS, Fields HL