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John B. Gurdon (left) and Shinya Yamanaka will share the prize, worth about $1.2 million.

The two scientists who won this year's Nobel Prize in Physiology or Medicine discovered that cells in our body have the remarkable ability to reinvent themselves. They found that every cell in the human body, from our skin and bones to our heart and brain, can be coaxed into forming any other cell.

The process is called reprogramming, and its potential for new drugs and therapies is vast. If neurons or heart cells are damaged by disease or aging, then cells from the skin or blood potentially could be induced to reprogram themselves and repair the damaged tissue.

The winners John Gurdon of the Gurdon Institute in Cambridge, England, and Shinya Yamanaka of Kyoto University in Japan and the Gladstone Institute in San Francisco made their discoveries more than 40 years apart.

In 1962, Gurdon proved that a cell from a frog's stomach contained the entire blueprint to make a whole frog. When he took the cell's nucleus and popped it into a frog egg, the egg developed into a normal frog.

This method eventually was used to clone all sorts of animals, including cats, dogs, horses and, most famously, Dolly the sheep the first mammal cloned from an adult cell. Gurdon, 79, continues to study reprogramming and was working in his lab when he received the call from the Nobel committee.

But a major obstacle stood in the way of further development of these stem cells: Getting the frog's stomach cell to strip away its specialization and turn into one of the 200 or so cell types known to exist in animals always required the use of an egg.

A question hung over the field for decades: Could a specialized cell reprogram itself all on its own?

In 2006, Yamanaka and graduate student Kazutoshi Takahashi found the answer, and it sent shockwaves through biology and medicine. They demonstrated that any cell could be reset and induced to develop into another cell type. And, even more remarkably, that it took little to get the job done.

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Nobel Winners Unlocked Cells' Unlimited Potential