鼠源性Fab段：特异性识别CD20 malignant CD20 B-cell killer- complement leukocyte system CD20 MabThera MabThera 人源性FC段：有效激活CDC和ADCC Malignant B-cells are destroyed after docking of MabThera Malignant B-cells are destroyed after docking of MabThera 人源性FC段：有效激活CDC和ADCC 鼠源性Fab段：特异性识别CD20