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Neuromelanin is a dark pigment found in various areas of the brain, particularly in the substantia nigra and locus coeruleus. It is a complex polymer that is formed as an end product in the metabolism of catecholamines (such as dopamine and noradrenaline). The exact chemical structure of neuromelanin is not yet fully understood and its functions in the body are the subject of ongoing research. However, it is believed that neuromelanin plays a protective role in the brain by binding excess metal ions and neutralizing potentially toxic substances.
The term melanin generally refers to a group of natural pigments that occur in many different living organisms and are responsible for the coloration of skin, hair and eyes. Melanin is produced in specialized cells, the melanocytes, and can occur in two main forms: Eumelanin (dark brown to black) and pheomelanin (red to yellow).
Although neuromelanin and melanins, which are found in hair and skin, are chemically related, they have different functions and production pathways. Neuromelanin is specific to the nervous system and is not directly involved in hair pigmentation. The ability of melanocytes to produce eumelanin or pheomelanin determines the color of the hair and skin.
In summary, there is no direct link between neuromelanin and hair pigmentation, except for the general category of melanins to which both belong. While neuromelanin plays a potentially protective role in the brain, the melanins in the skin and hair are primarily responsible for pigmentation and protection against ultraviolet radiation.
Related terms: Melanin / Pheomelanin / Eumelanin
