成年动物肝脏在正常情况下几乎没有细胞的分裂增生;但在肝细胞数量明显减少时,肝的再生速度几乎与胚胎时的发育速度及恶性肿瘤组织的生长速度相等,短期内即可恢复到原肝重的水平,然后,肝组织的生长速度又陡然降了下来。肝脏如此巨大的再生能力及其精确的调控机能,至今仍未完全清楚。近年来的研究表明,除了表皮生长因子(Epithelial Under normal conditions, the liver of an adult animal has almost no cell division and proliferation. However, when the number of liver cells is significantly reduced, the rate of liver regeneration is almost equal to the growth rate of an embryo and the growth rate of a malignant tumor tissue, The level of liver weight, and then, the growth rate of liver tissue and suddenly dropped down. Such a huge regenerative capacity of the liver and its precise regulation function have not yet been fully understood. In recent years, studies have shown that, in addition to epidermal growth factor (Epithelial