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Well, there are two kinds of stem cells: adult stem cells, which you can get from any part of a grown body, and embryonic stem cells. These are the inner- core of days-old embryos that can develop into any kind of cell.
嗯，有两种干细胞:成年干细胞和胚胎干细胞。成年干细胞可以从身体的任何部位获得。这些是日积月累的胚胎的内核，可以发育成任何一种细胞。