TNFRSF1B and graft versus host disease: Dawson et al, compared 10 costimulatory domains, including CD28, 4-1BB, ICOS, CTLA-4, PD-1, GITR, OX40 and TNFR2, in a xenogeneic GVHD model using the HLA-A2 CAR Treg platform (85).