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Florescent protein from jellyfish
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Because biofluorescence requires light to enable the process, it is most common on shallow reef systems. Still, life will find a way. Some deepwater species, such as the "deep-sea loose-jaw dragonfish" - which gets a gold star for its name - produce blue light through bioluminescence, then re-emit that light as red biofluorescence to improve their hunting success. This knowledge is useful. The Nobel Prize in Chemistry in 2008 went to a team that used a fluorescent protein from jellyfish to transform the imaging of everything from brain structure to the AIDS virus. Conservation, too, can benefit. Over half the fish species living on coral reefs are those small, difficult to find “cryptics”. Standard fish counts can grossly underestimate the true biodiversity. Most of those small species are biofluorescent, though, so they light up like a nineties raver for divers with the right equipment. That leads to faster and better surveys.
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