Snell, George Davis, 1903-96, American immunologist, b. Bradford, Mass., Ph.D. Harvard, 1930. He was associated with the Jackson Laboratory in Bar Harbor, Maine from 1935 to 1973. His identification of the H-2 gene complex in mice helped make future organ transplants possible. Snell, Jean Dausset, and Baruj Benacerraf shared the 1980 Nobel Prize in Physiology or Medicine for their discoveries concerning the genetic basis of immune system responses. His work greatly increased the understanding of autoimmune diseases and histocompatibility (see transplantation, medical).