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live long. As for the liver, the detoxifier of all the natural plant poisons and drugs that pass a person's lips, its life on the chemical warfare front is quite short. Blast from the past (Image: Interim Archives/Getty Images nuclear bomb tests carried out during the cold war have had an unexpected benefit. The Karolinska team then turned to the brain, the renewal of whose cells has been a matter of much contention. Another contentious issue is whether the heart generates new muscle cells after birth. Piero Anversa of the New York Medical College in Valhalla.

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Everyone working on adult hippocampal neurogenesis is excited about this work, says Thuret. Carbon-14 enters the food chain and eventually finds its way into our cells, which integrate carbon-14 atoms into their DNA when a parent cell splits into two new daughter cells. Because this test can be used retrospectively, unlike many of the current methods used to detect cell proliferation, and because it does not require the ingestion of a radioactive or chemical tracer, the method can be readily applied to both in vivo and postmortem samples. The authors suggest that previous reports of adult cortical neurogenesis might be technical artifacts. The method has traditionally failed to resolve dates of samples that differ in age by less than a few hundred yearsaccurate enough perhaps to date ficktreffen in Oelde the youngest and oldest parts of the most ancient redwood trees, but not to tell how many newborn cells might. In practice, the method has to be performed on tissues, not individual cells, because not enough carbon-14 gets into any single cell to signal its age. The amount of carbon-14 in the atmosphere is therefore mirrored in the cells at the time they are born. Some experts believe the root cause is that the DNA accumulates mutations and its information is gradually degraded. A radioactive carbon isotope expelled by the blasts has been used to date the age of adult human brain cells, providing the first definitive evidence that we generate new brain cells throughout our lives. Many studies in mice show that young neurons are necessary for forming new memories. Cells from the muscles of the ribs, taken from people in their late 30's, have an average age.1 years, they say.

The authors estimated that using their method, they can put an age on human cells to within /- 2 years. But they also state that their method is only sensitive enough to detect a minimum of 1 percent of newborn cells in a given cell population, so that leaves open the possibility that there is some, albeit a very small amount, of newborn cells. But this has not been tested in humans. Although people may think of their body as a fairly permanent structure, most of it is in a state of constant flux as old cells are discarded and new ones generated in their place. Hence the extent of carbon-14 enrichment could be used to figure out the cell's age,.