Objective To investigate the effect of cytotoxic T lymphocyte associated antigen 4 immunoglobulin(CT?LA4Ig)combined with Sinomenine(SIN)on the survival of renal xenotransplantation. Methods The guinea pig / rat renal xe?notransplantation model was established,and 40 rats were randomly divided into the control group,the SIN group,the CT?LA4Ig group and the CTLA4Ig+SIN group,10 rats in each group. The transfection efficiency of renal allograft,the level of se?rum creatinine,the amount of urine,the survival time of renal allograft,the sur...