As always, some beautiful images at National Geographic. This time it's Glowing Animals: Beasts Shining for Science. In most cases, the fluorescent protein is implanted into the animals as a marker for a gene to be studied, typically for genetic diseases. A few of the specimens shown have naturally occurring fluorescence, scorpions for example. In the scorpion's case, scientists are not completely sure what purpose it serves but hypothesize the layer protects them from UV rays or serves as a daylight 'sensor'.
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