Word: blastocyst
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...always account for the specific factors that help determine success rates, such as the age of the patient and the quality of the embryos. At Stanford's fertility clinic, where doctors can carefully select high-quality embryos by growing them in the lab for five days, until the blastocyst stage, instead of the more usual three days, success rates have been on par, if not higher among single transfers, says Westphal. "When I look at our data, in patients with really good blastocysts, the pregnancy rates were comparable," Westphal says. "The singles were just as good if not better...
...Connecticut group's report, however, found that fully differentiated cells could prove useful in cloning, although they're still not sure why. Nearly 40% of these more mature cells developed to the blastocyst stage, at which point stem cells can be extracted, while only 4% of the more actively dividing cells did so. "That is good news for therapeutic cloning," notes Yang. From his research, Yang believes that most of the problems that occur in cloning occur after the blastocyst stage, when the embryo begins to divide to re-create all the tissue types in a developing fetus. "Based...
...embryo divides into more and more cells and forms a hollow ball of cells called a blastocyst...
Embryonic stem cells begin to form along the inside of the blastocyst, creating the inner cell mass...
...female volunteers, Hwang and Moon removed the eggs' genetic material and replaced it with DNA extracted from adult cells donated by the same women. They then used tiny bursts of electricity to fuse together the donor material and egg. Nourished in dishes, 30 of the hybrid eggs developed into blastocysts--balls of hundreds of cells that represent one of the earliest stages of fetal development. When couples undergo in-vitro fertilization, a blastocyst successfully implanted in the womb has a very good chance of becoming a baby...