C

DNA encoding the constant region of immunoglobulin heavy and light polypeptide chains. The heavy chain

C

gene is comprised of exons that encode the different homology regions of the heavy chain.

C

gene segment

DNA coding for a T cell receptor or an immunoglobulin polypeptide chain constant region. One or more exons may be involved. Constant region gene segments comprise immunoglobulin and T cell receptor gene loci DNA sequences that encode TCR

α

and

β

chains and nonvariable regions of immunoglobulin heavy and light polypeptide chains.