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Nature 412, 674-676 (16 August 2001) | doi:10.1038/35089223

The best supporting actors

Bas Kast1

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Glial cells were long thought to play a peripheral role in the theatre of the brain. But some neuroscientists now believe that they are intimately involved in the way the brain processes information. Bas Kast charts the cells' move into the limelight.

Until ten years ago, glial cells seemed destined for a life of anonymity. Despite being the most numerous type of cell in the human brain — outnumbering neurons by ten to one — glia were seen as little more than packing material.