51�Թ�

DNA is removed from a camel egg cell and replaced with DNA from a frozen body cell of a camel prized for some quality such as speed or beauty.

In this cloning technology, technicians replace the nucleus of an egg cell with a nucleus taken from a body cell.

Using methods that start with tissue cells called fibroblasts, researchers can engineer stem cells, which are cells capable of becoming any kind of body cell.

Instead, for mice, men and many other species, pluripotent cells can be made to order by taking an ordinary body cell and adding to it active copies of the four genes which encode the genetic switches that cause pluripotency.

The first concerns pluripotent stem cells, the predecessors of every other body cell.