For some reasons, I need to use C57 or DBA mice with impaired immune system for organ transplant from other species such as Rat or monkey. SCID/NOD mice, however, can not be used in my exprements. I wonder that is there any medicine or small moleculars can disrupt mouse immune system totally to let the organs or cells from other species survive? I hope this medicine can inhibit the function of T cells,B cells and NK cells. Anyone has some good ideas?