An<unk>  is a lymphocyte that has been activated by an antigen, which will further undergo clonal expansion to increase the number of lymphocytes capable of binding to that antigen.<unk> s are the most immature members of the protective cells involved in an immune response.Activated B cells may differentiate into memory cells or plasma cells, while activated T cells may differentiate into memory cells or effector cells that aid in the immune response.
Immunoblast
Ameloblast
Trophoblast
Lymphoblast
Histiocyte
Chondroblast
Koilocyte
Fibroblast