The battle over new nerve cells in adult brains intensifies

New methods are needed to settle the debate

nerve cells

NO SIGNS  In a study of human brains, young nerve cells (green) were visible in the memory-related hippocampus of a newborn (left), but were rare in a sample from a 13-year-old (center). None were seen in adult brains, including this sample from a 35-year-old (right).


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