Problems in the etiology of peptic ulcer; the resistance of the gastrointestinal tract to the digestive action of its own secretions.
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D004063:Digestion; D005750:Gastric Juice; D005753:Gastric Mucosa / Q000378:metabolism*; D041981:Gastrointestinal Tract / Q000378:metabolism*; D006801:Humans; D010437:Peptic Ulcer / Q000209:etiology*