4Haspot F, Seveno C, Dugast AS, et al. Anti -CD28 antibody -induced kidney allograft tolerance related to tryptophan degradation and TCR class Ⅱ B7 regulatory cells [ J ]. Am J Transplant, 2005,5 : 2 339 - 2 348.
5Guillot C, Menoret S, Guillonneau C, et al. Active suppression of allogeneie proliferative responses by dendritic cells after induction of long - term allograft survival by CTLA41g[J]. Blood,2003,101:3 325 - 3 333.
