Sun exposure before or after laser treatment can make the skin more sensitive and prone to developing dark spots
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This means that age-related greying might have a predetermined clock , and this clock might be based entirely on how many times melanocytes must divide, differentiate, and produce melanin to re-pigment a newly growing hair
An appropriate combination of the column type, column temperature, mobile phase composition and flow rate, injection volume, and detection system was studied to produce a simple, fast, economic, and yet selective and accurate assay method