based on this material it is proposed that chronic immunostimulation in the recipient caused by graft antigens and bacteria and virus antigens puts a stop to t-suppressor lymphocyte function and subsequent proliferation of the lymphoid tissue , and that this is a major factor in the appearance of tumours derived from mesenchymal tissue , whereas the occurrence of ectodermal tumours is a result of a series of other oncogenetic factors .
C0003320
antigens
C0003342
virus antigens