N-nucleotides

https://doi.org/10.1351/goldbook.13493
Non-templated nucleotides added to the junctions between antibody and T-cell receptor (TCR) variable (V) gene, diversity (D) gene, and joining (J) gene segments during gene rearrangement.
Source:
PAC, 2012, 84, 1113. (IUPAC glossary of terms used in immunotoxicology (IUPAC Recommendations 2012)) on page 1218 [Terms] [Paper]