Word: cloninger
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It was 10 years ago this week, on a warm July night, that a newborn lamb with an unique pedigree took her first breath in a small shed tucked in the Scottish hills a few miles south of Edinburgh. From the outside, she looked no different from thousands of other...
"We are still surprised that cloning works," says Ian Wilmut, the embryologist who led the team that created Dolly. Ten years and 15 mammalian species later, the efficiency of the process is no better than it was at Dolly's birth: only 2% to 5% of the eggs that start...
Clones are vulnerable throughout the cloning process, from their first days in a culture dish to their final moments in the womb to their first weeks after birth. (By contrast, embryos created by in vitro fertilization, which also start out in a petri dish, are pretty much home free if...
It's not hard to appreciate why. Mammalian cloning is an intricate process involving at least three animals, hundreds of eggs, hundreds of more mature cells and not a single sperm. The key challenge is to undo the development of an adult cell--which, like all cells, contains in its...
The good news, as far as cloning's future is concerned, is that those problems seem to be limited to the clones and are not passed on to the next generation. When clones mate with ordinary animals, their offspring are created by the natural merging of egg and sperm--not...