41.   Research using human embryos is currently limited by a congressional ban on federal funding.

42.   She said using such embryos would increase the chances of success for Australian scientists, who are at the forefront of worldwide stem cell research.

43.   Spokesman Joaquin Navarro-Valls said the pope opposes any stem cell research using embryos.

44.   That leaves open the question of how best to regulate research using human embryos.

45.   The controversy enters the realm of abortion law because critics argue that life will be destroyed if frozen embryos are not used.

46.   The firm said it plans to begin contacting donor couples for permission to use their embryos so Harvard scientists can extract stem cells.

47.   The panel is expected to propose a ban on using cloned embryos to create human babies.

48.   The pope opposes any stem cell research specifically using embryos, Vatican spokesman Joaquin Navarro-Valls said.

49.   While supporters of such research see great potential for medical breakthroughs, opponents insist it is wrong to use human embryos for research.

50.   A high-powered Singapore medical advisory group Friday called for a complete ban on cloning human beings, but gave its backing to stem cell research using human embryos.