John Gurdon

My first attempts to transplant nuclei in Xenopus were completely unsuccessful, because the Xenopus egg, unlike those of other amphibians, is surrounded by an extremely elastic membrane and jelly layer that make penetration by a micropipette impossible.

I think what's going to hurt the Republicans enormously is the extremist position of Mitt Romney on the immigration issue and states like New Mexico, states like Colorado, Nevada, Arizona - and I think it's going to be the margin of victory for President Obama, a very narrow victory.

The importance of the egg's non-nuclear material - the cytoplasm - in early development is apparent in the consistent relation that is seen to exist between certain regions in the cytoplasm of a fertilized egg and certain kinds or directions of cell differentiation.