Since uniparental es cells are not derived from viable embryos , their harvesting and use sidesteps many of the ethical concerns that plague traditional es cell therapies .

既然单系胚胎干细胞不是从可繁育的胚胎中获得，它们的收集和使用可以避开许多困扰着传统胚胎干细胞治疗的伦理学关注。