Ancient viruses have really gotten on our nerves, but in the best of ways.
One particular retrovirus — embedded in the DNA of jawed vertebrates — helps turn on production of a protein needed to insulate nerve fibers, researchers report February 15 in Cell. Such insulation, called myelin, may have helped make speedy thoughts and complex brains possible.
The retrovirus trick was so handy, in fact, that it showed up many times in the evolution of vertebrates with jaws, the team found.
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