1.   Although scientists could transfer nuclei from adult cells to egg cells, the frogs only developed to tadpoles, and they always died.

2.   By transferring the nucleus into a fresher cell from a younger woman, scientists hope they can avoid many problems of aging eggs.

3.   His group is transferring nuclei from damaged cells into immature healthy eggs to find out whether they will then divide normally and form healthy mature eggs.

4.   In fact, some researchers are already transferring nuclei from adult human cells.

5.   Hwang transferred the nuclei from body cells removed from five adult cows into cow eggs from which the nuclei had been removed.