title: Fifteenth midwinter conference of immunologists: lymphocyte differentiation.
mesh_terms: D000486:Allergy and Immunology / Q000266:history*; D001402:B-Lymphocytes / Q000276:immunology*; D002454:Cell Differentiation; D006666:History of Medicine; D013601:T-Lymphocytes / Q000276:immunology*; D014481:United States