The ability to generate histocompatible cells using cloning techniques addresses one of the most important challenges in transplantation - the problem of rejection.

Most failed to thrive but one embryo grew and divided five times, generating cells resembling embryonic stem cells.

These tissue stem cells also get old in time and start to generate tired or compromised cells.

Adult stem cells have the ability to renew themselves and generate new cells, but they can also become cancerous.

A single human skin stem cell grown in a laboratory dish can generate enough cells to clothe the entire body in skin.

He discovered a method to generate cells with multiple copies of the centrosome, a structure he discovered and named.

The stem cell population thus renews itself as it generates new cells for the tissue.

But the transplanted cells lived for a just few months before petering out and never generated new cells.

"The nanos turn their attention to those things, constantly regenerating themselves and making repairs and helping to generate new cells in their host."