title: Letter: Immune competence in Crohn's disease.
mesh_terms: D000917:Antibody Formation; D001402:B-Lymphocytes / Q000276:immunology; D003424:Crohn Disease / Q000276:immunology*; D007111:Immunity, Cellular; D007070:Immunoglobulin A / Q000032:analysis; D013601:T-Lymphocytes / Q000276:immunology
chemical_list: D007070:Immunoglobulin A