Lymphoblast
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Lymphoblasts are immature lymphocytes which typically differentiate to form normal lymphocytes but which proliferate uncontrollably in leukemia. In speaking about leukemia, "blast" is the short name used for lymphoblasts.
The National Cancer Institute (NCI) definition contradicts this usage. Their definition implies activated B-cells.
The Chronic Lymphocytic Leukemia Research Consortium defines a lymphoblast as "A lymphocyte that has become larger after being stimulated by an antigen. Lymphoblasts look like immature lymphocytes, and were once thought to be precursor cells."[1]
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 Blood cell lineage |
They are 2.5 nanometers in size
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