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embryonic stem cells have occupied center stage, chiefly because of their pluripotency -- that is their ease in differentiating into a variety of different cell types.
其中,胚胎干细胞 占据了中心地位, 主要是因为它的多能性-- 就是胚胎干细胞能轻松的分化成 不同种类的细胞。
and what myod essentially does is, it causes cells to differentiate into muscle cells. so this compound, myod, has been tested on a lot of different cell types and been shown to actually convert this variety of cell types into skeletal muscle cells.
myod所做的就是,导致细胞分化成肌细胞 因此,这种物质,myod, 已在很多不同的细胞类型上做过测试,结果表明 它可以将多种类型的细胞转化为骨骼肌细胞。
and here is the limitation: adult stem cells are mature cells, and, like mature human beings, these cells are more restricted in their thought and more restricted in their behavior and are unable to give rise to the wide variety of specialized cell types, as embryonic stem cells [can].
它有其自身的局限性: 成体干细胞是成熟的细胞, 就像成年人一样, 较难改变它们的思维定势 较难改变它们的行为方式 同时它们也不能像胚胎干细胞一样 分化成很多种 特定的功能细胞。