mutation

At least our genes are. The Nature website reports that establishing the age of each mutation in contemporary human populations is important to fully understand our evolutionary history and will help to us to develop new medicines for diseases caused by genes.

Many of these mutations have only recently arisen–approximately 73% of all of them (and 86% of the ones that cause disease) have arisen in the past 5,000-10,000 years, which sounds like a long time, but is a blink of an eye in evolutionary terms.
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