title: Investigation of gastrointestinal function--past, present, and future.
mesh_terms: D002446:Celiac Disease / Q000175:diagnosis; D002766:Cholecystokinin; D019411:Clinical Laboratory Techniques; D003967:Diarrhea / Q000175:diagnosis; D005243:Feces / Q000032:analysis; D005750:Gastric Juice; D005753:Gastric Mucosa / Q000378:metabolism*; D006728:Hormones / Q000378:metabolism; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007421:Intestine, Small / Q000378:metabolism*; D007583:Jejunum / Q000378:metabolism; D010179:Pancreas / Q000378:metabolism*; D010437:Peptic Ulcer / Q000175:diagnosis; D012633:Secretin; D013997:Time Factors
chemical_list: D006728:Hormones; D012633:Secretin; D002766:Cholecystokinin