Cambridge has a rich history of making discoveries about DNA - the genetic code inside each and every one of us. In the 50s Watson and Crick announced that they had unravelled the structure of DNA - the famous double helix shape. Now, 60 years later, another Cambridge scientist - Bill Amos - has made a further DNA discovery - this time about the way the genetic code changes or "mutates" to allow evolution to happen, as he explained to Graihagh Jackson.
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