新生神经元不是由成熟神经细胞产生的，而是来源于终身存在于大脑中的神经干细胞。

New neurons are born not from mature nerve cells but rather develop from neural stem cells that remain in our brains throughout life.

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利用血液去培育干细胞获得成功以后，朱敏设法诱导它们分化成三种细胞系：先是骨骼和软骨细胞，然后是肌细胞，再是神经元。

Using blood to nourish and grow the stem cells, Zhu managed to induce them to differentiate into three lineages: first bone and cartilage, then muscle, and then neuron.

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此外，尚有安全性方面的顾虑，因为有迹象表明从人干细胞分化来的多巴胺神经元可能引发肿瘤生长。

There have also been safety concerns, with signs that dopamine neurons developed from human stem cells can trigger the growth of tumors.

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