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Melanin exists in two main chemical forms:
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Cutaneous Responses to UV UV has many effects on skin physiology, with some consequences occurring acutely and others in a delayed manner. If the dose of UV exceeds a threshold damage response, keratinocytes activate apoptotic pathways and die. Pigment-independent cAMP-mediated epidermal thickening protects against cutaneous UV injury by keratinocyte proliferation. Proopiomelanocortin, a polypeptide precursor with multiple functions: Have a professional skin examination annually.