The protein domain issue is known as DUF1220. Humans have more than 270 copies of DUF1220 encoded in their DNA, far more than other species. The closer a species is to humans, the more copies of DUF1220 show up. Chimpanzees have the next highest number, 125. Gorillas have 99, marmosets 30 and mice just one.
Prof Sikela said: 'The one over-riding theme that we saw repeatedly was the more copies of DUF1220 in the genome, the bigger the brain. 'And this held true whether we looked at different species or within the human population.'
quoted from Dissecting Leftism August, 12, 2010
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