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They were less common in sub-Saharan African populations, for example.That does not mean one population is smarter than another, Lahn and other scientists stressed, noting that numerous other genes are key to brain development.

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Using DNA samples from ethnically diverse populations, they identified a collection of variations in each gene that occurred with unusually high frequency.

In fact, the variations were so common they couldn't be accidental mutations but instead were probably due to natural selection, where genetic changes that are favorable to a species quickly gain a foothold and begin to spread, the researchers report.

Francis Collins, director of the National Human Genome Research Institute.

Aside from not knowing what the gene variants actually do, no one knows how precise the model Lahn used to date them is, Collins added.

Smith; Geological Conservation Review Series, British Upper Cretaceous Stratigraphy; British Geological Survey, Geology of the country around Brighton and Worthing, Young and Lake; Robert Randell, British Chalk Fossils, Fossils of the Chalk 2nd edition, A. Safety notice: Fossil hunting can at times pose a risk to personal safety, in particular within environments close to the coast, cliffs or in quarries and when using the tools and equipment illustrated.

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