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What part of the brain has the most neuron growth? 

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However, since axon size and density are maintained, the neuronal growth may conversely be inherently limited by other restricted brain growth.
These observations show that the potential to form growth cones is distributed throughout the neuron and suggest that this normally repressed in some way by the neuronal microtubules.
Our data suggest that intrinsic information determines the site of growth cone emergence of an identified neuron in situ.
The results indicate that primates are characterized by significant variation in patterns of brain growth.

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