title: Letter: Age-related changes in T and B cells.
mesh_terms: D000328:Adult; D000367:Age Factors; D000818:Animals; D000941:Antigens; D001402:B-Lymphocytes / Q000276:immunology*; D002462:Cell Membrane / Q000276:immunology; D005455:Fluorescent Antibody Technique; D006801:Humans; D007104:Immune Adherence Reaction; D007074:Immunoglobulin G / Q000032:analysis; D007136:Immunoglobulins / Q000032:analysis*; D012756:Sheep / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000941:Antigens; D007074:Immunoglobulin G; D007136:Immunoglobulins