The stem cell debate: Should necessity trump ethics?

(Left) Stem cells that are not yet differentiated; nerve cells after differentiation, ready to perform specialised functions
When he cloned a frog as a student in the UK in 1962, John B Gurdon, now 82, had not been expecting the emergence of something useful for humans. The ‘Grandfather of Cloning’ has a different opinion now.
When Gurdon became the first man to clone an animal by manipulating the skin cells of an adult frog into an egg stripped of its nucleus, he did not expect to