Human brains are made of the same stuff, despite DNA differences

Despite vast differences in the genetic code across individuals and ethnicities, the human brain shows a "consistent molecular architecture," say researchers. The finding is from a pair of studies that have created databases revealing when and where genes turn on and off in multiple brain regions through development. They reveal that rapid gene expression during fetal development switches to much slower rates after birth, levels off in middle age, and surges in the final decades.

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