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| DNA Nucleotidylexotransferase Terminal Addition Enzyme | Terminal Deoxyribonucleotidyltransferase | Deoxynucleotidyl Transferase | Deoxynucleotidyltransferase | Desoxynucleotidyl Transferase | Desoxynucleotidyltransferase | Tdt Antigen | Addition Enzyme, Terminal A non-template-directed DNA polymerase normally found in vertebrate thymus and bone marrow. It catalyzes the elongation of oligo- or polydeoxynucleotide chains and is widely used as a tool in the differential diagnosis of acute leukemias in man. EC 2.7.7.31. |