And there's lots and lots of stem cell trials going on worldwide, and they use many different types of cells, but one common theme that seems to be coming out is that actually, very often, those cells will die once you've implanted them.
现在在全世界范围内有很多这样的干细胞实验， 他们使用很多不同种类的细胞， 但似乎得到的都是同一个结果， 就是这些细胞，一旦你将之移植 通常都会死掉。