Gold is rare and precious,while pyrite(FeS2)is abundant and cheap.Pyrite is nicknamed fool’s gold,since pyrite looks like gold and it is even shinier and brighter than gold.It is very difficult to recognize the differences between a real natural gold and a gold-like rock(pyrite)to non-professional persons[1],but we know that all that glitters is not gold.Similar mistakes can happen in biomedical research as well.Pluripotent embryonic or adult stem cells can self-renew and proliferate into different cells,and
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