Mutations Make Evolution Irreversible: By Resurrecting Ancient Proteins, Researchers Find That Evolution Can Only Go Forward

ScienceDaily (2009-09-24) -- Researchers have found that evolution can never go backwards, because the paths to the genes once present in our ancestors are forever blocked. The findings come from the first rigorous study of reverse evolution at the molecular level.

http://www.sciencedaily.com/releases/2009/09/090923143335.htm

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