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Currently, the Varki team is studying the potential role that this gene mutation could have played in actual brain expansion, as well as other later steps in human evolution that occurred during the last two million years.
"Of course, we only have a hypothesis right now to test. And, the expansion of the brain during human evolution occurred in multiple steps and is very likely to have involved multiple genetic changes," Varki said.
Copyright 2002 Newswise
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