TdT: Definition
TdT, short for terminal deoxynucleotidyl transferase, is a protein found in the nucleus of very young, immature lymphocytes. Pathologists test for TdT to help diagnose acute lymphoblastic leukemia and lymphoblastic lymphoma, which are cancers made of these immature cells. TdT also helps the pathologist diagnose thymoma, a tumor of the thymus gland in the chest. …
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