Eumelanin is the darker pigment (brown and black)
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These three amino acids, while non-essential as they can be produced by the body, contribute to the synthesis of glutathione, with cysteine being the rate-limiting factor due to its rarity in food sources
doi:10.1017/S1461145713001685 McCoy, Alene T et al
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However, as mobile phone usage continues to soar, concerns about their potential impact on human health have intensified [2, 3]