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How does melanin help protect epidermal cells from ultraviolet radiation?

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Learn how regenerative properties of the skin helps to protect the human body from the external environment — human skin Human skin, whose cells are generated continuously by the body, serves as a protective barrier between the inside of the human body and the environment.

Melanin serves as a critical protective pigment in the human skin by acting as a chemical shield against ultraviolet radiation. Produced by specialized cells called melanocytes, melanin is transferred to neighboring keratinocytes via branching dendrites to form an epidermal melanocyte unit.12

Once inside these epidermal cells, melanin granules migrate to a position directly above the cell nucleus, effectively forming a protective shroud. By absorbing ultraviolet rays, the pigment limits the radiation's penetration into deeper tissues, thereby helping to prevent damage to the cell's DNA. This natural defense mechanism is essential for minimizing the harmful effects of sun exposure, such as carcinogenic changes and premature skin aging.23