Term Name:	endothelial cell activation within high endothelial venule involved in immune response
Synonyms:	endothelial cell activation within high endothelial venule during immune response
Definition:	A change in the morphology or behavior of an endothelial cell within a high endothelial venule resulting from exposure to an activating factor such as a cellular or soluble ligand, leading to the initiation or perpetuation of an immune response.
Ontology:	GO: Biological Process [GO:0002259]    QuickGO    AmiGO