无论如何，如果我们检查这些螺旋状 DNA 的末端，我们会发现每条人类染色体的末端都有一个被称作“端粒”的 DNA 序列。
Anyway, if we examine these ends of these coils of DNA, we will find a sequence of DNA at each end of every human Chromosome, called a telomere.
因为端粒保护染色体末端，阻止细胞分裂。
Because telomeres protect the ends of chromosomes to stop cells dividing.
我在我的实验室里已经发现，人的心理压力确实会加快细胞的老化，这从染色体末端即端粒的损耗程度上可以看出来。
A. In my lab, we’re finding that psychological stress actually ages cells, which can be seen when you measure the wearing down of the tips of the chromosomes, those telomeres.
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