Flawed embryos seen as source for stem cells

From what is now considered medical waste might be fashioned bio-treasure: stem cells able to form into any of the body's 220 cell types, including blood, nerves, bone, and skin tissue, new research suggests. The poor quality embryos are "an ethically acceptable source" for the creation of stem cell lines. Scientists at Children's Hospital Boston have forged stem cells from the "flawed" and "poor quality" early-stage embryos that in vitro fertilization clinics discard by the hundreds of thousands every year, according to research published yesterday in the journal Nature Biotechnology.