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.
They work like the plastic tips of shoelaces to protect the ends of chromosomes, the strings of genes in the heart of every cell that tell it what to do. Without telomeres, our cells would lose the ability to divide and would quickly die off. Scientists have been fascinated by telomeres for several decades.