From a single fertilized egg cell can spring more than two hundred diverse tissues of the human body. ... The power of reproducing and differentiating stem cells offers the best hope of realizing such treatments, cures, both cheap and reliable.
On August 9, 2001, President George Bush announced that he would permit federally funded research on existing stem cells lines derived from human embryos. He prohibited the federal funding of research on any cell lines created after that date. ... And second, if they’re going to be destroyed anyway, shouldn’t the be used for a greater good, for research that has the potential to save and improve other lives?” This allows us to explore the promise and potential of stem cell research without crossing a fundamental moral line, by providing taxpayer funding that would authorize or encourage further destruction of human embryos that have at least the potential for life. “For the existing cell lines, Bush said, “the life and death decision has already been made. ... The keys these functions are stem cells. Stem cells divide giving creation to more stem cells of the same type. Stem cells are not committed to becoming one type of cell or another but can differentiate into any of several types at need. Unipotent stem cells are those that can only differentiate into one or several cell types of the tissue in which they are found. Multipotent stem cells are able to develop several different tissues. Pluripotent stem cells can give rise to completely different tissues of different embryonic germ layers. And totipotent stem cells are capable of forming any cell of the body. ... After about four days and several cycles of cell division the cells begin to specialize into a blastocyst. The outer layers of the cell will go on to form support structures like the placenta. The inner cell mass will become the fetus. About day 14, the inner cell mass has the potential to split, forming identical twins in some cases.
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