程序性死亡即凋亡，在胚胎发育，变态，正常组织更新和自我平衡过程中都有发生。
Programmed cell death mediated by a process termed 'apoptosis' is the physiological cell death that occurs during embryogenesis, metamorphosis, normal tissue turnover and homeostasis.
脂肪干细胞是已知的多能干细胞，它们能产生多种细胞、组织类型，但是他们不如胚胎干细胞全能性。
The stem cells found in fat are known as multipotent stem cells. They can produce a variety of cell and tissue types, but are not as flexible as embryonic stem cells.
使用单系胚胎干细胞进行组织移植中的问题便是其耐用性和安全性。
One issue in using uniparental ES cells for tissue transplants is their durability and safety.
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