title: Human T lymphocyte subpopulations in chronic periapical lesions.
mesh_terms: D002908:Chronic Disease; D006801:Humans; D010483:Periapical Diseases / Q000276:immunology* / Q000473:pathology; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology*; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*