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在内脏、皮肤和骨髓等不断更新的细胞群中,干细胞被认为是具有高度自我更新能力并能向各子代分化的一小群细胞。干细胞具有不对称分化的特点,其一种子代细胞由于分化结局不同可与另一种子代细胞截然不同。不对称性或干细胞性分化也可发生在其它成熟组织,如乳腺、子宫内膜的条件更新群,在胚胎发育过程中可被辨识。干细胞作为一种关键机制对所有动物的生长发育和保持细胞的多样性都十
In an ever-renewing cell population such as viscera, skin, and bone marrow, stem cells are considered to be a small group of cells that are highly self-renewing and capable of differentiating into their offspring. Stem cells have the characteristic of asymmetric differentiation, and one kind of progeny cells can be completely different from another generation of generation cells due to different differentiation outcomes. Asymmetry or stem cell differentiation can also occur in other mature tissues, such as the conditional renewal population of the mammary gland, endometrium, and can be identified during embryonic development. Stem cells serve as a key mechanism for the growth and development of all animals and maintain the diversity of cells.