Fig. 2.
upper panels, One-way paradigm in which transplantation is conceived as involving a unidirectional immune reaction: host-versus-graft (HVG) with whole-organ transplants (a) and graft-versus-host (GVH) with bone marrow transplants (b). lower panels, Two-way paradigm in which transplantation is seen as a bidirectional and mutually canceling immune reaction that is predominantly HVG with whole-organ grafts (c), and predominantly GVH with bone marrow grafts (d).