Age, weight, and social effects on ulceration rate in rats.
D000375:Aging; D000818:Animals; D001522:Behavior, Animal; D001835:Body Weight; D004597:Electroshock; D008297:Male; D010437:Peptic Ulcer / Q000209:etiology; D051381:Rats; D013312:Stress, Physiological / Q000503:physiopathology*