A clever trick borrowed from jellyfish has earned two Americans and one Japanese scientist a share of the chemistry Nobel Prize.
Martin Chalfie, Roger Tsien and Osamu Shimomura made it possible to exploit the genetic mechanism responsible for luminosity in the marine creatures.
Today, countless scientists use this knowledge to tag biological systems.
These glowing markers will show how brain cells develop or cancer cells spread through tissue.
Jellyfish will glow under blue and ultraviolet light because of a protein in their tissues. Scientists refer to it as green fluorescent protein, or GFP.
From the BBC News