41. The essential question for cloning researchers was whether the genes in an adult cell could still be used to create a new animal with the same genes. 42. The genes of the adult cell take over the egg, directing it to divide and form an embryo. 43. The report noted some of the limitations of research with adult cells. 44. The scientists then try to fuse these mini-eggs with adult cells, like skin cells. 45. The trick, Wilmut said, was the starvation of the adult cells. 46. These adult cells are found in many organs, apparently residing there as a natural source of tools for repairing the body. 47. Therefore, he argued, this method was not in the same ethical ball park as cloning from an adult cell. 48. This reprogramming of DNA is presumably what happened when mice were cloned this July from adult cells. 49. What was unique about Dolly was that she was said to have been cloned from a highly specialized adult cell. 50. What if cells cloned from just-formed embryos can save the lives that adult cells cannot save, by better regenerating organs and brains? |