Lymphoblasts are immature lymphocyte which typically differentiate to form normal lymphocyte but which proliferate uncontrollably in leukemia. In speaking about leukemia, "blast" is the short name used for lymphoblasts.

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• Glossary L note its definition:

lymphoblast: A lymphocyte that has gotten larger after being stimulated by an antigen. Lymphoblasts look like immature lymphocytes, and were once thought to be precursor cells.

Lenfoblast