Exact(23)
The experiment resulted in three new variants, or lines, of stem cells.
Mr. Bush had restricted he financing to studies of existing colonies, or lines, of stem cells, estimated at about 60.
Scientists' reservations pertain to whether the 60 lines of stem cells sanctioned by Mr. Bush are of high enough quality to be useful.
Mr Kerry would lift Mr Bush's ban on federal funding of research on "lines" of stem cell created after August 2001.
However, the experiment started with 304 egg cells and resulted in the development of only two lines of stem cells, one of which had an abnormal Y chromosome.
But to cultivate the self-perpetuating colonies, or lines, of stem cells, the researchers must destroy human embryos, a process that draws strong criticism from religious conservatives and abortion opponents who are an important element of Mr. Bush's political base.
Similar(36)
"Reprogramming is an incredibly important find," said Dr. James Thomson, the University of Wisconsin researcher who first cultured a line of stem cells from human embryos in 1998.
The work demonstrated an important principle but also revealed the logistical difficulties: 16 women donated 242 eggs to obtain the single line of stem cells.
Scientists at the university and the company derived a line of stem cells from monkeys that could be maintained for months and that spontaneously differentiated into many types of cells including beating heart cells, according to the patent application, which has been published in Europe but not yet granted.
The following year a team of researchers from the University of Newcastle upon Tyne was able to grow a cloned human embryo to the 100-cell blastocyst stage using DNA from embryonic stem cells, though they did not generate a line of stem cells from the blastocyst.
The removed cell can be examined and, if the gene in question is present, the embryo it came from will not be implanted into the mother.ACT's researchers were not the first to think that such biopsied cells might, instead, be encouraged to reproduce thus generating a line of stem cells.
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