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目的：正常人体细胞经过一定数目的分裂后，端粒（ｔｅｌｏｍｅｒｅ）逐渐缩短，最后进入一种不分裂状态，也称衰老（ｓｅｎｅｓｃｅｎｃｅ）状态。端粒酶（ｔｅｌｏｍｅｒａｓｅ）是一种反转录酶，它用自身模板合成端粒重复序列（ＴＴＡＧＧＧ）ｎ，使端粒维持一定的长度，细?
OBJECTIVE: After a certain number of divisions of normal human cells, telomeres gradually shorten and finally enter a state of non-split, also called senescence. Telomerase is a reverse transcriptase that uses its own template to synthesize telomere repeat sequence (TTAGGG)n to maintain a certain length of telomeres.