As a qualitative trait, the plumage colour of poultry is determined by the relative content and distribution of eumelanin
and phaeomelanin produced in melanocytes.
Melanin is the substance that gives skin, hair and eyes their colour, dependent on the relative amounts of the two forms of melanin, eumelanin
Chinchilla mutations permit transmission of eumelanin
, which generally comprises the spots, blotches, and stripes typically occurring on most patterned felids.
An analogue of a-MSH, SCENESSE (R) is a linear peptide which activates the skin to release eumelanin
, the dark pigment which is known to have photoprotective properties (providing skin protection against light and UV radiation).
Hair colour at birth depends upon how much of the two types of melanin - Eumelanin
and Pheomelanin - they produce.
The murine Agouti gene encodes a paracrine signaling molecule that promotes follicular melanocytes to produce yellow phaeomelanin pigment instead of black eumelanin
There are two different types of melanin, eumelanin
with black pigments and phaeomelanin with yellow pigments.
Its first role is to disrupt some of the chemical bonds found in eumelanin
and phaeomelanin, the natural pigments responsible for black to brown and red to yellowish hair respectively.
, which is dark brown to black, lacks cysteine.
Redhead Scots are 10 times more likely than average to get skin cancer because they lack a pigment called eumelanin
Skin contains two kinds of pigments, or melanins: pheomelanin, which is reddish or yellow, and eumelanin
, which is dark and brownish.
Gray feather coloration is caused by the deposition of eumelanin
in the feather cortex and rufous feather coloration is caused by deposition of phaeomelanin (Hill 2010, Pannkuk et al.
Genetic evidence suggests that the evolution of skin rich in the dark pigment eumelanin
occurred in early humans between 1.
An analogue of [eth]-MSH, afamelanotide is a linear peptide which activates eumelanin
of the skin, the dark pigment which is known to provide photoprotective properties (offering skin protection against light and UV radiation).
The coloration of hairs in mammals is mainly determined by the distribution of two types of melanin, eumelanin
and pheomelanin, which produce brown to black and yellow to red colorations, respectively (Oribe et al.