South Korean scientists have used cloning techniques to create glow-in-the-dark dogs.
The four puppies look like typical beagles by day but glow red under ultraviolet light.
Their nails and abdomens, which have thin translucent skin, look red even to the naked eye.
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Seoul National University professor Lee Byeong-chun, who headed the research team, said the technique of using fluorescent genes went beyond the novelty of glowing dogs.
He said: "What's significant in this work is not the dogs expressing red colours but that we planted genes into them.
