"It's a different way to begin separating out nature and nurture, and to see how different this boy would be. But I have many times been asked if my children have followed me into research — it's something people subconsciously expect. For a clone, the pressure would be even greater. People would expect the clone to be like the original, and put expectations and limitations on them, and that's the reason why I don't like to use that technique. I think people should be wanted as individuals."