Umbilical cord blood transplants are associated with delayed or failed engraftment in about 20% of patients.背景：在大约20%25的成人患者，脐血移植与移植物植入延迟或失败有关。
After successful engraftment of this modified bone marrow, the mice are no longer apt to bleed to death after minor injury.成功后植入这一修饰后的骨髓后，受轻伤的小鼠已不再容易流血致死。
