title: [Clinical investigation of serum group I pepsinogen (PGI). Comparison of immunoreactive PGI and proteolytic activity].
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010435:Pepsinogens / Q000097:blood*; D010437:Peptic Ulcer / Q000201:enzymology; D010447:Peptide Hydrolases / Q000097:blood; D011863:Radioimmunoassay
chemical_list: D010435:Pepsinogens; D010447:Peptide Hydrolases