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In adolescence the growth of _____, the fatty tissue that forms around axons and speeds neurotransmission, enables better communication with other brain regions.

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The answer to this question would be myelin.

Myelin cells are forming a sheath around the axon of a neuron. This sheath will limit the area where ion exchange happens so that is only able to happen every a certain distance. This causes the electrical signal move more quickly than it used to be.
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