Within hours, skin cells divide and crawl to cover the wound with a wound epidermis.

This may affect theway that mouse cells divide.

Telomeres are caps on the end of chromosomes that protect the rest of the genetic code from damage, but each time cells divide they can get shorter before eventually disappearing.

As the cells divide, they dilute the virus until it disappears, he said.

Normal cells divide as many times as needed and stop.