No pain, no gain?
Holloway
M
M
D000818:Animals; D004723:Endorphins / Q000502:physiology*; D008526:Medulla Oblongata / Q000503:physiopathology*; D009020:Morphine / Q000008:administration & dosage; D010146:Pain / Q000503:physiopathology*; D051381:Rats
D004723:Endorphins; D009020:Morphine