Word: womb
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With tons of soft tissue on ice, geneticists have no shortage of mammoth DNA to play out their fantasy: tweeze a bit of it out, insert it into the ovum of an elephant--a close living cousin--and implant the embryo in the elephant's womb. Before long, a woolly bundle should appear...
...most of the century, scientists widely accepted the view that the brain goes through a huge growth spurt from the womb through a person's first few years ? and then spends the rest of life deteriorating. Since the mid-'80s, scientists have been aware of new brain cell growth after the formative years, but have debated whether or not the new growth affects advanced functions such as memory. Now researchers Elizabeth Gould and Charles Gross, in an article in Friday's edition of the journal Science, report that testing in monkeys shows the growth of new neurons that attached themselves...
STOKING THE STORK Just as the first test-tube baby comes of age--Louise Brown turned 21 in July--there's a major advance in in-vitro fertilization. Waiting four days instead of three before transferring an embryo from the lab dish to the mother's womb can increase the odds of the implantation's success. The new technique is called blastocyst transfer...
...evidence is stuffed into a scrapbook that she hugged to her chest during a court hearing last month. It includes a sperm-donor list, the stick from an early pregnancy test that still shows the positive lines indicating a baby had been conceived, ultrasound pictures of Zoey in the womb and a letter from Kazmierazak's former partner. It reads: "Thank you for having our beautiful little girl with me...You are her mommy and will always be. I will never do anything to change that. I promise you." The evidence has not been heard in court...
While the age of the donor is probably partly responsible, the research team--which included Ian Wilmut, Dolly's creator--may have discovered another factor. The more time a clone embryo spent in a test tube before transfer to a womb, the shorter the clone's telomeres. "In culture, cells go through 20 divisions," says research director Alan Colman. "That's a significant percentage of the 150 they go through in a lifetime...