François Guillemot and Carlos Parras are at the Division of Molecular Neurobiology of the National Institute for Medical Research, Mill Hill, London NW71AA, UK. fguille@nimr.mrc.ac.uk
The rodent brain constantly generates new granule and periglomerular interneurons to replenish the olfactory bulb. New work shows that the two subtypes are derived from distinct progenitor populations, revealing unexpected diversity among adult neural stem cells.
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