Word: beginnings
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...created by inserting the nucleus from a donor's cell, usually a skin cell, into an egg cell, whose DNA-containing nucleus has been removed. The new cell then starts to divide and produce stem cells. In some cases, however, through mistakes in the nuclear-transfer process, eggs may begin dividing on their own. And Hwang may have increased his chances of parthenogenesis by using the gentler, squeezing technique he pioneered to remove the egg's nucleus; the process may have actually left behind enough genetic material for the egg to spontaneously divide. "As the egg starts to mature, [these...
...that parthenogenetic stem cells have been discovered, will we finally begin to see the kind of individualized treatments - for diabetes, Parkinson's, Alzheimer's and spinal cord injuries - that science has promised? Probably not. Although parthenogenesis is easier to achieve than nuclear transfer - about 20% of the time, eggs can be stimulated to divide on their own, compared to a 3%-5% development rate for nuclear transfer embryos - parthenogenesis still requires a steady supply of good quality human eggs. These are notoriously difficult to obtain, so the technique won't likely revolutionize medicine yet. But, suggests Daley, it could...
...single diagnosed case can mean several collateral victims. Worse, OCD is a condition that often masquerades as other things. It is routinely labeled depression, bipolar disorder, attention-deficit/hyperactivity disorder (ADHD), autism, even schizophrenia. Victims often conceal their problem for years, ensuring that no diagnosis--right or wrong--can begin to be made...
...Sichuan's Qu County, the floodwaters have now receded. But with crops destroyed and livestock killed, the prices for meat and vegetables are soaring. And, as residents begin to rebuild, they also think about what could happen next time. "The floods in this area have gotten worse and worse over the years," says Xu. "I was never worried about the flood...
...British and other Western powers are hanging their main hopes for ending the conflict on talks with Darfur's various rebel groups in Arusha, Tanzania, due to begin in the next few days. That appears a slim hope. For one thing, the rebels are a fractious bunch. On Monday, a new split was reported in the ranks of the hardline Islamic Justice and Equality Movement (J.E.M.) over who would represent them in Arusha. And even if they can agree a common platform, the Sudanese government still has to agree to meet them. Khartoum's preferred method of dealing with Darfuris...