A debt-to-GDP ratio of 60% is quite often noted as a prudential limit for developed countries. This suggests that crossing this limit will threaten fiscal sustainability. For developing and emerging economies, 40% is the suggested debt-to-GDP ratio that should not be breached on a long-term basis.
1 Telomerase is found in high levels in germline cells (egg and sperm) and stem cells. 2  In these cells telomere length is maintained after DNA replication and the cells do not show signs of ageing. 3  Telomerase is also found in high levels in cancer cells.
(1994) Specific association of human telomerase activity with immortal cells and cancer. Science 266: 2011â2015. Lingner J, Hughes TR, Shevchenko A et al. (1997) Reverse transcriptase motifs in the catalytic subunit of telomerase.