Sir john 's prizewinning study , published half a century ago , in 1962 , when he was at oxford university , was to transplant the nuclei of cells from adults of a frog called xenopus laevis into enucleated eggs of that species .
In a prizewinning essay , endorsed by the telephone industry , one stickler asked : " would you rush into an office or up to the door of a residence and blurt out ' hello ! Hello ! Who am I talking to ? ' No. "
