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structures first discovered in the neurogenic zone of the brain. Fractones primarily consist of proteoglycans such as laminin and HSPG. These proteoglycans bind growth factor in the extracellular matrix to regulate stem cell proliferation, which has been demonstrated in the adult brain neurogenic zone, where fractones are responsible for the production and differenciation of new neurons. The main role of these structures, linked to a wide array of cells, is to act as

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