“…In this respect, we have found another intruiging effect of blood transfusion on the T cell repertoire. HLA-sharing blood transfusion not only leads to functional holes in the CTL response but also induces a selective decrease in the usage of T cell receptor VB families [14], Thus, HLA-sharing blood transfusion affects the T cell repertoire in a specific and non-specific fashion. How can we explain the immunomodulating effects of blood transfusion?…”