0257-277X/87/0064-028852.75/0 T Cell Gamma Receptor

The search for the ~t- and 13-genes ncod-ing the T cell antigen receptor heterodimer (TCR) led to the fortuitous discovery of a third rearranged immunoglobulin-like T cell gene, called), [1-5]. Like ct and [3,), is formed from rearrangement of V to J gene segments and has encording sequences that are similar to Ig V and C domains. Sequence diversity is more limited in),- than in ~t- and [3-cDNA but it is, nonetheless, clearly apparent at the junction of the 3'-gene's V and J gene seg-ments. Recently additional genes encoding Vv and Cv regions have been identified, in-creasing initial estimates of limited murine)' diversity [6-8].),-Message diversity, take