The tra lants do not require major surgery, just a tube i erted into a vein in the abdomen so that the cells can be dri ed into the liver, where they take up residence in tiny blood ve els.

• 移植手术不需要动大手术，只需要在患者腹部的血管中插入一个导管把细胞倒入患者的肝脏，细胞就依附在肝脏细小的血管上。