Melanocyte-stimulating hormone normally stimulates melanocytes to make black eumelanin , but if the melanocytes have a mutated receptor, they will make reddish pheomelanin instead. The festival is paid for by the local government in Breda, a city in the south east of the Netherlands. It appears, for instance, in Singaporean newspapers such as The Straits Times ,  and in television programmes and films. It is held by some authorities that this was done to fertilize the fields and produce a bounteous harvest, red-hair symbolizing the golden wealth of the corn. However, when UV-radiation is strong as in regions close to the equator the lower concentration of melanin leads to several medical disadvantages, such as a higher risk of skin cancer. It also has been shown that individuals with pale skin are highly susceptible to a variety of skin cancers such as melanoma , basal cell carcinoma , and squamous cell carcinoma. Studies by Bodmer and Cavalli-Sforza hypothesized that lighter skin pigmentation prevents rickets in colder climates by encouraging higher levels of vitamin D production and also allows the individual to retain heat better than someone with darker skin. In cases of severe malnutrition , normally dark human hair may turn red or blonde.
Red hair frequency is especially significant among the Riffians from Morocco and Kabyles from Algeria,    respectively. Film and television programmes often portray school bullies as having red hair. The international event began in , when Dutch painter Bart Rouwenhorst decided he wanted to paint 15 redheads. The pigment pheomelanin gives red hair its distinctive color. The first reprints important debates on the topic and traces the evolution of pornographic film, including comparing its development to that of Hollywood cinema. The essays are divided into two sections. The three men were subsequently jailed for a combined total of ten years and one month for the attack. The second part presents new essays that consider current trends in the field, including pornography's expansion into new technologies. One study found that people with red hair are more sensitive to thermal pain associated with naturally occurring low vitamin K levels ,  while another study concluded that redheads are less sensitive to pain from multiple modalities, including noxious stimuli such as electrically induced pain. However, when UV-radiation is strong as in regions close to the equator the lower concentration of melanin leads to several medical disadvantages, such as a higher risk of skin cancer. Studies by Bodmer and Cavalli-Sforza hypothesized that lighter skin pigmentation prevents rickets in colder climates by encouraging higher levels of vitamin D production and also allows the individual to retain heat better than someone with darker skin. A study showed women with red hair had a greater analgesic response to that particular pain medication than men. The National Geographic article in fact states "while redheads may decline, the potential for red isn't going away". Because of the natural tanning reaction to the sun's ultraviolet light and high amounts of pheomelanin in the skin, freckles are a common but not all-inclusive feature of red-haired people. Abd ar-Rahman I also had red hair, his mother being a Christian Berber slave. Modern Northern and Western Europe Red hair is most commonly found at the northern and western fringes of Europe ;  it is centered around populations in the British Isles. One variety of albinism Type 3, a. In several countries such as India , Iran , Bangladesh and Pakistan , henna and saffron are used on hair to give it a bright red appearance. Redheads today are commonly associated with the Celtic nations  and to a far lesser extent the Germanic peoples. The festival is paid for by the local government in Breda, a city in the south east of the Netherlands. The comedian " Carrot Top " uses this stage name. There is little or no evidence to support the belief that people with red hair have a higher chance than people with other hair colors to hemorrhage or suffer other bleeding complications. When henna is used on hair it dyes the hair to different shades of red. Red hair is associated with fair skin color because low concentrations of eumelanin throughout the body of those with red hair caused by a MC1R mutation can cause both. As a boy he had bright red hair, and it is amusingly recorded that one day in the streets of Norwich a number of boys followed him, pointing to his red locks and saying, "Look at that boy; he's got a bonfire on the top of his head," and that John Gurney was so disgusted that he went to a barber's, had his head shaved, and went home in a wig. It appears, for instance, in Singaporean newspapers such as The Straits Times ,  and in television programmes and films.
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