One of the differences between white matter and gray matter is that gray matter has a myelin sheath.

Name: One of the differences between white matter and gray matter is that gray matter has a myelin sheath.
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White matter has a myelin sheath, which helps to speed up the transmission of signals between different regions of the brain. Gray matter does not have a myelin sheath, but it does contain more cell bodies and dendrites than white matter.

One of the Differences Between White Matter and Gray Matter