A serendipitous photo taken during a scuba-diving trip in the Caribbean clued researchers into the world of a mysterious green and glowing eel. Though the green eel species is known for being shy and reclusive, divers managed to catch two and examine their glowing properties. An analysis showed that the eels have a completely newfound class of fluorescent protein that needs bilirubin to glow. These proteins likely helped shape the eels' evolution, and may help researchers developnew techniques in the lab.
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