<unk> s are  immature cells which typically differentiate to form mature lymphocytes. Normally<unk> s are found in the bone marrow, but in acute<unk> ic leukemia (ALL),<unk> s proliferate uncontrollably and are found in large numbers in the peripheral blood.
Although commonly<unk>  refers to a precursor cell in the maturation of leukocytes, the usage of this term is sometimes inconsistent. The Chronic Lymphocytic Leukemia Research Consortium defines a<unk>  as "A lymphocyte that has become larger after being stimulated by an antigen.<unk> s look like immature lymphocytes, and were once thought to be precursor cells.". Commonly, when speaking about leukemia, "blast" is used as an abbreviation for<unk> s.
Lymphoblast
Histiocyte
Oocyte
Immunoblast
Lymphocyte
Megakaryoblast
Monocyte
Hematopoietic stem cell