Research published mainly in nineteen seventy-three had found proteins on the surfaces of nerve cells in the brain.

VOA: special.2010.05.04

"What we know from research on teen brain development, is that teens don't really have fully developed brains until they're twenty-five years old.

VOA: special.2010.07.01

"What we know from research on teen brain development, is that teens don't really have fully developed brains until they're 25 years old."

VOA: standard.2010.06.24

The latest research focuses on serotonin, a chemical in the brain.

VOA: standard.2010.02.08