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In page White matter:
"The other main component of the brain is grey matter (actually pinkish tan due to blood capillaries), which is composed of neurons. The substantia nigra is a third colored component found in the brain that appears darker due to higher levels of melanin in dopaminergic neurons than its nearby areas. White matter can sometimes appear darker than grey matter on a microscope slide because of the type of stain used. Cerebral and spinal white matter do not contain dendrites, neural cell bodies, or shorter axons,[citation needed] which can only be found in grey matter.
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