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所谓干细胞,是未充分分化的细胞,这些细胞具有各种组织器官的潜在功能,它们如同建筑中的钢筋水泥黄沙一样,在生命的成长和发育中起“主干”作用,被誉为“万能细胞”。干细胞分三类:全能干细胞、多能干细胞和专能干细胞。全能干细胞可以分化成人体的各种细胞,这些分化出的细胞构成人体的各种组织和器官,最终发育成一个完整的人。人类的精子和卵子结合后形成受精卵就是一个初始的全能干细胞。受精卵继续分化,在前几个分化过程中,可以分化出许多全能干细胞。全能干细胞在进一步的分化中,形成各种多能干细胞。这些多能干细胞将会发育
The so-called stem cells, are not fully differentiated cells, these cells have the potential function of various tissues and organs, as they are in the building of reinforced concrete yellow sand, play a “trunk” role in the growth and development of life, known as the “universal cell”. Stem cells divided into three categories: all-purpose stem cells, pluripotent stem cells and pluripotent stem cells. The totipotent stem cells can differentiate into various kinds of cells of the human body. These differentiated cells form various tissues and organs of the human body and eventually develop into a complete human. Human sperm and egg form a fertilized egg is an initial totipotent stem cells. Fertilized eggs continue to differentiate, in the first few differentiation process, can differentiate many pluripotent stem cells. In its further differentiation, totipotent stem cells form a variety of pluripotent stem cells. These pluripotent stem cells will develop