This book contains the proceedings of the Serono Symposia USA interna tional symposium on Genetic Models of Immune and Inflammatory Dis eases held on October 20 to 23, 1994, in Savannah, Georgia. The advent of methods for introducing genes into the germlines of mice, and for targeted disruption of particular genes by homologous recombination, has provided scientists in many disciplines with an extraordinarily powerful set of analyti cal tools. Some of the most informative applications of transgenic and gene knockout technology have been in studies of lymphocyte development and activation. The...