South Korean scientists claim to have put fluorescent genes into eggs to create four cloned dogs (all named Ruppy) that glow red under ultraviolet light. The same feat has been accomplished with mice, pigs and cats previously. Behind the effort: Showing that these genes can be implanted in eggs that then produce the freak dogs means other genes can be implanted, work that could ultimately lead to ways of treating disease in humans. So far, noble as the efforts may be, the work has led to animals that glow.

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