Reduced behavioral activity due to opiate blockade: relations to stress.
D000818:Animals; D004723:Endorphins / Q000502:physiology*; D008297:Male; D009043:Motor Activity / Q000187:drug effects / Q000502:physiology*; D009270:Naloxone / Q000031:analogs & derivatives*; D009271:Naltrexone / Q000494:pharmacology; D051381:Rats; D013312:Stress, Physiological / Q000503:physiopathology*; D013997:Time Factors
D004723:Endorphins; D009270:Naloxone; D009271:Naltrexone