人体的绝大部分细胞,因为高度分化往往会失去再分裂的能力。但是,肌体在发展过程中会保留一定数量的尚未分化、具有自我更新能力的原始细胞,这些就是干细胞,也称为“源泉细胞”。干细胞在英语的字面意思就是能长出枝、干的细胞,它具有自我更新、增殖与分化能力和超乎人们想像的 The vast majority of cells in the body, because highly differentiated tend to lose the ability to divide again. However, in the process of development, the body retains a number of undifferentiated and self-renewing primitive cells. These are stem cells, also called “source cells.” The literal meaning of stem cells in English is that they can grow branches and stem cells, which have the ability of self-renewal, proliferation and differentiation and beyond the imagination of people