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Does my hon. Friend agree that in the early and late 1960s people were replacing cell nuclei from frogs, mice and other animals, with very positive results? Bob Briggs in Indiana and John Gurdon at Oxford did marvellous things with cell nuclear replacement at that time. We have waited 30 years to consider the question of whether the technique should be used on human beings. That is how science works: it takes a long time to move from work on lower organisms to work on higher organisms.