In tissue and organ transplantation, the<unk>  theory is the proposition that<unk> s within a transplanted allograft sensitize the recipient's alloreactive T-lymphocytes, causing transplant rejection. The concept was first proposed by George Davis Snell and the term coined in 1968 when Elkins and Guttmann showed that<unk> s present in a donor graft initiate an immune response in the recipient of a transplant.
Passenger leukocyte
Nonspecific immune cell
Reactive lymphocyte
Tingible body macrophage
Mast cell
Respirocyte
Dendritic cell
Natural killer cell