P-nucleotides

https://doi.org/10.1351/goldbook.13530
Palindromic nucleotide sequences generated at the junctions between antibody and T-cell receptor (TCR) variable (V), diversity (D), 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 1224 [Terms] [Paper]