N-terminal amino acid sequence of a human delta-chain myeloma protein

The N-terminal amino acid sequence (26 residues) of a delta-chain of a human myeloma (Er I) is homologous with the prototype sequence of the human VHIII subgroup. This indicates that the delta-chain is using for its V region the same pool of V genes as the rest of the immunoglobulin classes. Implications of this finding are discussed.