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Stem-cell therapies 干细胞治疗 Prometheus unbound 普罗米修斯自由了 Researchers have yet to realise the old dream ofregenerating organs. But they are getting closer 亘古以来，器官再生便是人类的夙愿。如今研究人员虽然还未真正实现，但成功的脚步已经越来越近 PROMETHEUS, a Titan bound to a rock by Zeus, endured the daily torture of an eaglefeasting on his liver, only to have the organ regrow each night. 在希腊神话之中，提坦普罗米修斯被宙斯束缚在一块巨石之上，白天忍受着老鹰啄食他的肝脏，夜晚他的肝脏却又总会再次生长。 Compared with this spectacle, a video on the website of Nature this week seems decidedlydull. 与生动的故事情节相比，本周《自然》网站上的一段视频就显得如此枯燥。 It shows a collection of pink dots consolidating into a darker central glob. 这段视频向世人展示了无数粉红色的小点向中心聚拢，成为一个颜色更深的团状物的过程。 But something titanic is indeed happening. 但这正是普罗米修斯自由的曙光。 The pink dots are stem cells, and thevideo shows the development of a liver bud, something which can go on to look and act likea liver. | 
