The endothelial structure of the postcapillary venules of the lymph node and the passage of lymphocytes across the venule wall.
D000818:Animals; D002465:Cell Movement; D006224:Cricetinae; D004727:Endothelium / Q000648:ultrastructure; D006168:Guinea Pigs; D008198:Lymph Nodes / Q000098:blood supply*; D008214:Lymphocytes / Q000502:physiology* / Q000648:ultrastructure; D051379:Mice; D008855:Microscopy, Electron, Scanning; D051381:Rats; D014680:Veins / Q000648:ultrastructure*; D014699:Venules / Q000648:ultrastructure*