sciencehabit (1205606) writes "For all those brunettes wishing they were naturally blond, a small genetic change could have made all the difference. Scientists have found that replacing one of DNA's four letters at a key spot in the genome shifts a particular gene's activity and leads to fairer hair. Not only does the work provide a molecular basis for flaxen locks, but it also demonstrates how changes in segments of DNA that control genes, not just changes in genes themselves, are important to what an organism looks like."
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