Frances Arnold from the United States and Gregory Winter of Britain made the comments Friday ahead of Monday's presentation of the prize.
"We've been modifying the biological world at the level of DNA for thousands of years," Arnold said at a news conference, citing examples such as new dog breeds. "Somehow there is this new fear of what we already have been doing and that fear has limited our ability to provide real solutions."
They were named winners along with American George Smith for advances that the award characterized as speeding up evolution of enzymes and proteins.
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