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根据 Hayflick[1]的遗传学说,组成人体的大部分细胞从胚胎开始共分裂约50次,每次分裂周期约2.4年,因此人的最高寿命可达120岁,此后停止正规分裂而死亡。实验室培养的人肺细胞的正常衰老过程,若在培养基中添加维生素 E,这些细胞就能分裂达120次以上,即使分裂这样多次以后,看上去还很年轻。这意味着遗传的快慢是可以人为地加以调节的。
According to the genetics of Hayflick [1], most of the cells that make up the human body divide from the embryo about 50 times, with about 2.4 years of each division cycle. As a result, the maximum life expectancy of a human being can reach as high as 120 years old. The normal aging process of lab-grown human lung cells, which are capable of dividing more than 120 times by adding vitamin E to the medium, appears to be young even after such multiple divisions. This means that the speed of heredity can be artificially adjusted.