21.   The process requires the destruction of a small amount of bone.

22.   Yet cloning to create stem cell lines, as the lab claims to have done, requires the destruction of human embryos.

23.   However she is prepared to wait until new processes are developed which do not automatically require the destruction of the specimens.

24.   But controversy has raged internationally over the ethics of harvesting stem cells, which requires the destruction of fertilized eggs that can grow into humans.

25.   Pardew urged the Bosnian Serbs to comply with arms control agreements which require the destruction of weapons.