1.   Before she could use the fetal skin cells, Dr. Matalipova had to detach them from each other.

2.   For such purposes, it is sufficient to clone from fetal skin cells, which are easy to grow in the laboratory.

3.   On Sunday morning, Dr. Matalipova saw the new nuclei, from the fetal skin cells, in the host eggs.

4.   They began with fibroblasts, or fetal skin and connective-tissue cells.