title: Serum angiotensin converting enzyme activity in silicosis.
mesh_terms: D000368:Aged; D006801:Humans; D008297:Male; D008875:Middle Aged; D007703:Peptidyl-Dipeptidase A / Q000097:blood*; D011859:Radiography; D012829:Silicosis / Q000000981:diagnostic imaging / Q000201:enzymology*
chemical_list: D007703:Peptidyl-Dipeptidase A