Word: blastocyst
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...Embryonic stem cells are controversial. They come from the inner cell mass of a blastocyst, the term for a fertilized egg four days after conception. But while many pro-life advocates stand firm in their opposition to using embryonic cells for research, others, including Senator Orrin Hatch, have cast their lot with the scientific community in favor of continuing research funding. High-profile activists, including actor Michael J. Fox, who suffers from Parkinson?s disease, have appeared before congressional subcommittees urging that research continue. (Stem cell research, of course, will continue on some level no matter what the President decides...
...through, and arguments detailed enough to withstand some questioning can be referred to by shorthand. The ethical debate on cloning isn’t settled—in fact, the opposing camps aren’t even fully formed—and unlike the definition of “blastocyst,” a good ethical argument can’t be summarized into a five-minute statement or a 15-second sound byte...
...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...
...Once an egg is fertilized by one of the many spermatozoa, it is then transferred to another dish of blood serum and sustaining nutrients. For the next three to six days, the fertilized egg divides, creating a cluster of cells called a blastocyst...
...After the woman receives further hormone treatment to prepare the uterine lining, the blastocyst is placed in the uterus, where it attaches to the wall and normal embryo development proceeds-as it would from a natural conception...