Recently documented examples of neurogenesis, the production of new brain cells, include the brain growing in mice when placed in a stimulating environment or neurons increasing in canaries that learn new songs.
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Athe brain growing in mice when placed in a stimulating environment or neurons increasing in canaries that
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Bmice whose brains grow when they are placed in a stimulating environment or canaries whose neurons increase when they
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Cmice's brains that grow when they are placed in a stimulating environment or canaries' neurons that increase when they
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Dthe brain growth in mice when placed in a stimulating environment or the increase in canaries' neurons when they
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Ebrain growth in mice that are placed in a stimulating environment or an increase in neurons in canaries that
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