title: Experimentation and thymic selection.
authors.affiliation: Immunology Branch, National Cancer Institute, Bethesda, MD 20892.
authors.forename: A
authors.initials: A
authors.lastname: Singer
mesh_terms: D006801:Humans; D007108:Immune Tolerance; D007111:Immunity, Cellular; D012641:Selection, Genetic; D013601:T-Lymphocytes / Q000276:immunology*; D013950:Thymus Gland / Q000276:immunology*