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循环的吞噬细胞是机体防御微生物侵入的主要成分,其中最重要的细胞是成熟的中性粒细胞。中性粒细胞来源于骨髓中的前身细胞(Precursor cell),它们的形成以自身稳定机制所调节。干细胞干细胞就是能够复制自己并产生更多分化的子细胞那种细胞。原始的干细胞叫做多能干细胞,因为它能分化为各种血液细胞系统,而单能干细胞只能定型地向着
Circulating phagocytes are the main components of the body against microbial invasion, of which the most important cells are mature neutrophils. Neutrophils are derived from the precursor cells in the bone marrow and their formation is regulated by their own stabilizing mechanisms. Stem cells Stem cells are the kind of cells that replicate themselves and produce more differentiated daughter cells. The primitive stem cells are called pluripotent stem cells, because they differentiate into various blood cell systems, whereas the pluripotent stem cells can only stereotyped toward