Thymectomy and engraftment of thymic tissue.
D000375:Aging; D000818:Animals; D000831:Animals, Newborn; D007111:Immunity, Cellular; D013934:Thymectomy / Q000379:methods*; D013950:Thymus Gland / Q000254:growth & development / Q000276:immunology* / Q000637:transplantation