Paul Nurse, who won the Nobel Prize in 2001 along with Lee Hartwell and Timothy Hunt for their discoveries in cell cycle regulation, writes in to the UK's Times Online. His letter addresses the proposed British ban on creating human-animal embryos - scientists have said this is a possible avenue for stem cell research - and encourages everyone to hold off final decisions until there's more of an opportunity to educate the public about the subject. "We have to battle not only against these terrible diseases but also against misunderstanding and fear," writes Sir Nurse.