human somatic cells

The reverse transcriptase telomerase is able to maintain stable telomeric length and essential for the unlimited proliferation of tumor cells. Telomerase activity has been detected in 85-90% of human tumors and tumor-derived cell lines but not in most human somatic cells.

端粒酶表达于85%以上的肿瘤细胞中，能够维持细胞中端粒的长度，对永生化细胞的增殖具有重要作用，而在大多数人正常体细胞中却没有表达。

Conclusion Cells isolated from adult human dental pulp are clonogenic, and have multipotent differentiation potential, satisfying the criteria of postnatal somatic stem cell.

结论成功的从人第三恒磨牙牙髓中分离得到牙髓干细胞。

Recent advances indicate that the expression of telomerase activity is repressed in most normal human somatic cells but is reactivated during the carcinogenesis of most human cells.

最近研究表明，端粒酶在绝大多数肿瘤细胞中表达活性，而在正常人体细胞中几乎无端粒酶活性表达。

In human somatic cells, telomeres shorten by 30 to 200 bp with each cell division. When telomeres were shortened to some threshold value, cell senescence or apoptosis was triggered.

随着细胞分裂端粒每次缩短30～200bp，当端粒缩短到某临界长度时，细胞则发生衰老或凋亡。

Telomerase activity was found to be absent in most normal human somatic cells and S. cerevisiae but present in over 90% of cancer cells.

正常人体细胞（非生殖细胞）及酿酒酵母细胞中端粒酶活性的表达很低，用一般的方法几乎检测不到，在90%以上的恶性肿瘤细胞中可检测到端粒酶活性。