<unk> , schematic image<unk> , micrograph in a peripheral blood smear. They are medium-sized lymphocytes with prominent nucleoli. A<unk>  is a white blood cell with a certain state of cellular differentiation in lymphocytopoiesis. In the 20th century it was believed that a sequence of general maturation changed cells from lymphoblasts to<unk> s and then to lymphocytes (the lymphocytic series), with each being a precursor of the last. Today it is believed that the differentiation of cells in the lymphocyte line is not always simply chronologic but rather depends on antigen exposure, such that, for example, lymphocytes can become lymphoblasts. The size is between 10 and 18 μm.
Prolymphocyte
Koilocyte
Plasma cell
Podocyte
Monocyte
Lymphoblast
Reactive lymphocyte
Dendritic cell