Elevation of Intracellular Cyclic AMP in Alloreactive CD4+ T Cells Induces Alloantigen-Specific Tolerance That Can Prevent GVHD Lethality In VivoMatthew J. O’Shaughnessy, Bruce R. Blazar, Irene Gramaglia et al.|Transplantation and Cellular Therapy|2007Cited by 18