The Nobel Prize in chemistry goes to three men who revolutionized molecular life science, Japan's Osamu Shimomura and Americans Martin Chalfie and Roger Tsien. They develop tools to light up and see individual proteins inside living cells. These tiny molecular flashlights make it possible to study numerous events that take place in cells and whole organisms that were previously invisible—such as the development of nerve cells or the spread of cancer cells. In 1962 Shimomura, now emeritus professor at the Marine Biological Laboratory at Woods Hole, discovered that jellyfish produce a green fluorescent protein, GFP, that glows when exposed to ultraviolet light. Some 30 years later, Columbia University's Chalfie showed that the GFP gene could be put into any organism. By making sure the fluorescent protein was expressed at the same time as other proteins of interest.