ABSTRACT
Synthetic peptides (and polypeptides) that are antigenic. They are found very infrequently in living organisms.
D exon
A DNA sequence that encodes a portion of the third hypervariable region of the immunoglobulin heavy chain. It is situated on the 5
′
side of J exons. An intron lies between them. During lymphocyte differentiation, V-D-J sequences are produced that encode the complete variable region of the heavy chain.
