[Development and structure of the thymus gland: on the origin of thymic cells].
D000818:Animals; D002642:Chick Embryo; D006801:Humans; D066298:In Vitro Techniques; D008214:Lymphocytes / Q000166:cytology*; D051379:Mice; D008854:Microscopy, Electron; D051381:Rats; D013950:Thymus Gland / Q000033:anatomy & histology*