terminal deoxynucleotidyl transferase

initialism: TDT
https://doi.org/10.1351/goldbook.13728
Enzyme that inserts non-coded nucleotides at the junctions of V, D, and J gene segments of immunoglobulin (Ig) and T-cell receptor (TCR) locus DNA, thus increasing the diversity of antigen-specific recognition.
Source:
PAC, 2012, 84, 1113. (IUPAC glossary of terms used in immunotoxicology (IUPAC Recommendations 2012)) on page 1251 [Terms] [Paper]