The thymus gland.
D000328:Adult; D000361:Agammaglobulinemia; D000740:Anemia; D001327:Autoimmune Diseases; D003480:Cushing Syndrome; D005260:Female; D006801:Humans; D007109:Immunity; D008297:Male; D009157:Myasthenia Gravis; D013950:Thymus Gland / Q000196:embryology / Q000276:immunology; D013953:Thymus Neoplasms