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The full genetic basis of hair color is complex and not fully understood. [1] Regulatory DNA is believed to be closely involved in pigmentation in humans in general, [2] and a 2011 study by Branicki et al. identified 13 DNA variations across 11 different genes that could be used to predict hair color. [3]
Eye color is determined by a few different genetic factors, the most important being OCA2. OCA2 produced melanocytes, or melanin producing cells. Melanin is the protein that creates skin, eye and ...
Poliosis circumscripta, commonly referred to as a "white forelock", is a condition characterized by localized patches of white hair due to a reduction or absence of melanin in hair follicles. Although traditionally associated with the scalp, poliosis can affect any hairy area on the body, including eyebrows, eyelashes, and beards.
Whereas Titian hair is a brownish shade of red hair, auburn hair is specifically defined as including the actual color red. Most definitions of Titian hair describe it as a brownish-orange color, [1] [2] but some describe it as being reddish. [3] This is in reference to red hair itself, not the color red.
The degree of hair shedding is reduced with the use of minoxidil. 7 in 11 loose anagen hair syndrome patients find visible improvement after using minoxidil lotion. [10] Treatment involving the maintenance of nutrients within the patient and biotin have not made any noted impacts to the improvement of loose anagen hair syndrome.
As hair pigmentation is a result of complex interaction between various genetic factors, it is thought that premature greying could be due to exhaustion of melanocyte's capability to produce hair pigmentation. [1] Premature canities may occur alone as an autosomal dominant condition or in association with various autoimmune or premature aging ...
Prepubertal hypertrichosis is characterized by an excess of hair growth, seen during birth and progressing during childhood. [3] [6] In generalized hypertrichosis, excessive hair growth occurs all over the body, whereas in localized hypertrichosis, excessive hair growth only occurs in certain areas of the body. [2]
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