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A stem cell is essentially a blank cell capable of becoming another, more differentiated cell-type in the body, such as a skin cell, a muscle cell or a nerve cell.

干细胞本质上是一种空白细胞，能够成为体内另一种分化程度更高的细胞类型，如皮肤细胞、肌肉细胞或神经细胞。

— Virginia Foxx 佛吉利亚·福克斯