Description: The DTA-1 monoclonal antibody reacts with mouse GITR, Glucocorticoid-Induced TNFR family gene, also known as TNFRSF18. In naïve mice, GITR is expressed predominantly by CD4+CD25+ T regulatory cells (Treg) and by CD25+ CD4+ CD8- thymocytes. Stimulation of GITR abrogates Treg cell-mediated suppression. The removal of GITR-expressing Treg cells or the administration of DTA-1 resulted in organ specific autoimmune disease.