obsolete skin/hair/eye pigmentation, variation in, 2
MONDO:0044259
OBSOLETE. Two types of melanin, the red pheomelanin and the black eumelanin, are present in human skin. {22:Valverde et al. (1995)} noted that eumelanin is photoprotective, whereas pheomelanin may contribute to UV-induced skin damage because of its potential to generate free radicals in response to ultraviolet radiation. Individuals with red hair have a predominance of pheomelanin in hair and skin and/or a reduced ability to produce eumelanin, which may explain why they fail to tan and are at risk from ultraviolet radiation. In mammals, the relative proportions of pheomelanin and eumelanin are regulated by melanocyte-stimulating hormone (see OMIM:176830), which acts via its receptor (MC1R) on melanocytes to increase the synthesis of eumelanin, and also via the product of the agouti locus (AGTI; OMIM:600201), which antagonizes this action.
Disease research snapshot
No clinical trials have been linked to this exact normalized concept in the current published dataset. This is a coverage limitation, not evidence that the condition or medicine has never been studied. Try a synonym or browse registry-reported labels.
Numbers are derived from CureCurrent's current ClinicalTrials.gov projection and conservative MONDO/RxNorm mappings. See sources, counting rules and limitations and verify eligibility or clinical findings with the original study record.
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