Did a Mutation Give Humans Thought?

Although humans and chimpanzees genetically vary by just 1.2 percent, that small percentage makes a world of difference in the mental and linguistic capabilities between the two species. A study shows that a certain form of neuropsin, a protein that plays a role in learning and memory, is expressed only in the central nervous systems of humans. The scientists conclude that this critical difference originated less than 5 million years ago.

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