The concept of the centron.
D000818:Animals; D000941:Antigens; D002244:Carbon; D066298:In Vitro Techniques; D008198:Lymph Nodes / Q000166:cytology*; D008214:Lymphocytes; D008264:Macrophages; D051381:Rats; D013194:Staining and Labeling
D000941:Antigens; D002244:Carbon