Previous experiments using stem cells from embryos have shown promise in replacing lost cells, but the use of these is controversial. (newscientist.com)
The derivation of stem cells from embryos remaining following infertility treatments is justifiable only if no less morally problematic alternatives are available for advancing the research. (thepublicdiscourse.com)
The researchers then extracted stem cells from the embryos and grew the cells in dishes in the lab. (scientificamerican.com)