"The research proposed by the Crick Institute team will use spare embryos that will never be implanted. If not used in ethically approved research they will eventually be allowed to die. Women who donate their spare embryos for research know how it feels to be unable to have a child without help. In donating their embryos to research they are acknowledging the debt they owe to those who have gone before them and demonstrating their wish that those who will follow may be able to benefit as they have done.