
Keywords: NAc; nucleus accumbens; COS; cream, oil, and sugar emulsion; Î-FNA; β-funaltrexamine; nor-BNI; nor-binaltorphimine; DAMGO; [D-Ala2,N-MePhe4,Gly-ol]-enkephalin; CTAP; D-Phe-Cys-Tyr-D-Trp-Arg-Thr-Pen-Thr-NH2; M-W-F; Monday-Wednesday-Friday; IA; in