title: On the 20th anniversary of a scientific discovery.
mesh_terms: D000486:Allergy and Immunology / Q000266:history; D000818:Animals; D003585:Cell Biology / Q000266:history; D002465:Cell Movement; D049673:History, 20th Century; D008196:Lymph; D008214:Lymphocytes; D051381:Rats; D013897:Thoracic Duct