pheomelanins

pheomelanins

(fē-ō-mĕl′ă-nĭnz) [″ + Gr. melas, black]
Yellow-brown, sulfur-containing pigments present as the pigment in human red hair.
References in periodicals archive ?
There are two different types of melanins: eumelanins and pheomelanins. The former produces black and brown pigments while the latter produces red and yellow pigments.
There appears to be a hint of fine structure characteristic of pheomelanins, as opposed to eumelanins, which are present in light hair [38].
eumelanins and pheomelanins which are responsible for black/brown and yellow/red colors, respectively.
There are two types of pigment I eumelanins and pheomelanins. Dark brown or black hair is a result of eumelanins, and pheomelanins are responsible for blond or red.
Eumelanins and pheomelanins: characterization by electron spin resonance spectroscopy.
(1,116) The type of melanin produced depends on cellular genotype and environmental factors, resulting in the black pigment eumelanin, the reddish to yellow pigment pheomelanin, or the mixed melanin that contains both components.
In pheomelanogenesis, vesiculoglobular bodies are incorporated into stage I melanosomes, while at stage II melanosome pheomelanin is deposited in the vesiculoglobular bodies.
For the spectrophotometric assay of pheomelanins, hair sample suspensions were solubilized in a phosphate buffer (pH 10.5) and cleared by centrifugation at 10 700 g for 10 min.
For the spectrophotometric assay of alkali-soluble melanin (pheomelanins and some eumelanins) the procedure was the same as for SpPM, but hair sample suspensions were solubilized in 8 M urea/1 M sodium hydroxide.
Though the phenotypes of eumelanin and pheomelanin of alpaca were not identified, the phenotype of the alkali-soluble melanin (including pheomelanins and eumelanins) can represent grossly the color of hair (Figure 2).
The contents of the pheomelanins in different hair colors were very low, and had no relationship to the alpaca hair color.
The results also showed that eumelanins and pheomelanins existed in small quantities in white alpaca hair.