Morphine addiction in the rat in a solitary and in a "social" situation.
D000818:Animals; D006801:Humans; D008297:Male; D009021:Morphine Dependence / Q000503:physiopathology*; D009043:Motor Activity / Q000187:drug effects; D051381:Rats; D012919:Social Behavior; D012931:Social Environment; D012934:Social Isolation; D013375:Substance Withdrawal Syndrome / Q000503:physiopathology; D013997:Time Factors