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For example, researchers want to make embryonic stem cells from a person with a disease like Alzheimer's and turn the stem cells into nerve cells in a petri dish. 举例来说，研究人员希望从一个患有一种疾病如阿尔茨海默氏症病人中获得胚胎干细胞，使干细胞在皮氏培养皿中分化为神经细胞。