(from the article `Benacerraf, Baruj`) At NYU Benacerraf began to study the genetics of the immune system. His experiments led to his development of the concept of immune response (Ir) ...
<molecular biology> Any of several genes of the major histocompatibility complex that control the immune response of lymphocytes to specific antigens. ... (09 Oct 1997) ... 
See I-region.