title: Effect of morphine treatment and withdrawal on endogenous methionine- and leucine-enkephalin levels in primate brain.
mesh_terms: D000818:Animals; D001923:Brain Chemistry / Q000187:drug effects*; D002522:Chlorocebus aethiops; D004743:Enkephalin, Leucine / Q000032:analysis*; D004744:Enkephalin, Methionine / Q000032:analysis*; D005260:Female; D008297:Male; D009020:Morphine / Q000494:pharmacology*; D009271:Naltrexone / Q000494:pharmacology; D013375:Substance Withdrawal Syndrome / Q000378:metabolism*
chemical_list: D004744:Enkephalin, Methionine; D004743:Enkephalin, Leucine; D009271:Naltrexone; D009020:Morphine