TOPICS: Graft success, autograft, syngraft (isograft), allograft, xenogeneic graft, immunosuppressants, ABO blood group, HLA similarity, donor, recipient, immunocompromised, host, acute rejection reaction, lymphocytic infiltrate, chronic rejection reaction, fibrosis, graft vs. host disease, T cells, Type IV hypersensitivity reaction, bone marrow transplant, organ dysfunction