title: Recent theories on the pharmacological basis of tolerance and dependence.
mesh_terms: D000818:Animals; D001921:Brain / Q000378:metabolism; D003216:Conditioning, Operant; D004361:Drug Tolerance; D006706:Homeostasis; D006801:Humans; D007858:Learning; D009020:Morphine / Q000378:metabolism; D018377:Neurotransmitter Agents / Q000378:metabolism; D013375:Substance Withdrawal Syndrome; D019966:Substance-Related Disorders
chemical_list: D018377:Neurotransmitter Agents; D009020:Morphine