A change in the morphology or behavior of a cell resulting from exposure to an activating factor such as a cellular or soluble ligand, leading to the initiation or perpetuation of an immune response.
chondrocyte activation
complement activation +
cytokine production involved in immune response +
egg activation +
encapsulation of foreign target +
endothelial cell activation +
fibroblast activation +
follicular dendritic cell activation +
glial cell activation +
granuloma formation +
humoral immune response +
immune complex clearance +
immune response in gut-associated lymphoid tissue +
immune response involved in response to exogenous dsRNA