title: Ontogeny of thymus factor secretion.
abstract: The circulating thymic factor (TF) detected by 0-conversion assay has been followed up in ontogeny. Serum TF evaluation in pregnant thymectomized mice and in new born mice indicates that TF secretion starts on day 12-13 of foetal life and has reached the adult's level at birth.
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D005865:Gestational Age; D051379:Mice; D013156:Splenectomy; D013601:T-Lymphocytes / Q000166:cytology / Q000276:immunology*; D013934:Thymectomy; D013950:Thymus Gland / Q000196:embryology / Q000502:physiology*