Answer :
N-nucleotides are first inserted by a very distinct mechanism in human light-chain genes and some heavy-chain gene rearrangements, though. Because they are not template-encoded, N-nucleotides are given this name.
An immunoglobulin heavy or light chain's V region, or V domain, is encoded by many gene segments. The V domain of the light chain is encoded by two distinct DNA sequences. The first segment, which is known as a V gene segment because it encodes the majority of the V domain, contains the first 95–101 amino acids of the light chain. The second segment, also known as a joining or J gene segment, encodes the remaining 13 amino acids of the V domain.
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