DR3, also known as TNFRSF25, lymphocyte-associated receptor of death (LARD), WSL-1, TRAMP, TR3 and APO3, is a 55 kD glycoprotein belonging to the TNF receptor superfamily (TNFRSF). TNFSF25 is expressed at low level on CD4-positive, CD8-positive T cells and NKT cells. It has been shown to stimulate NF-kappaB activity and regulate cell apoptosis. The signal transduction of this receptor is mediated by various death domains containing adaptor proteins. Recently, it has been shown that TNFRSF25 is also expressed on Treg cells and regulates Treg proliferation.