A worm gene is swapped out with a green fluorescent protein, or GFP. All we have to do to look at it is shine blue light on it and wherever it's being made, we'll see green. We can follow the animals and say, okay, when during development is this made? And then other scientists took that tool in entirely new directions. Everyone wants more.
An accidental discovery on a nighttime walk led one scientist and his team to wonder: How many mammals glow under ultraviolet light? The list keeps growing, but scientists still aren’t sure why these furry creatures glow.
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