TY - GEN AU - Vaught,J L AU - Takemori,A E TI - Differential effects of leucine and methionine enkephalin on morphine-induced analgesia, acute tolerance and dependence SN - 0022-3565 PY - 1979///0328 KW - Analgesia KW - Animals KW - Brain KW - drug effects KW - Drug Synergism KW - Drug Tolerance KW - Endorphins KW - pharmacology KW - Enkephalins KW - Humans KW - Male KW - Mice KW - Morphine KW - metabolism KW - Morphine Dependence KW - etiology KW - Reaction Time N1 - Publication Type: Comparative Study; Journal Article; Research Support, U.S. Gov't, P.H.S ER -