title: Chronic obstructive pulmonary disease and secretory IgA.
mesh_terms: D000368:Aged; D006801:Humans; D007070:Immunoglobulin A / Q000378:metabolism*; D007071:Immunoglobulin A, Secretory / Q000378:metabolism*; D008173:Lung Diseases, Obstructive / Q000276:immunology*; D008297:Male; D008875:Middle Aged; D000515:alpha 1-Antitrypsin / Q000378:metabolism
chemical_list: D007070:Immunoglobulin A; D007071:Immunoglobulin A, Secretory; D000515:alpha 1-Antitrypsin