title: Letter: T and B lymphocytes.
mesh_terms: D000328:Adult; D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology*; D004912:Erythrocytes / Q000276:immunology; D006801:Humans; D007104:Immune Adherence Reaction; D007958:Leukocyte Count; D008297:Male; D012756:Sheep; D013601:T-Lymphocytes / Q000276:immunology*