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Red hair or ginger hair occurs naturally in one to two percent of the human population , appearing with greater frequency two to six percent among people of Northern or Northwestern European ancestry and lesser frequency in other populations. It is most common in individuals homozygous for a recessive allele on chromosome 16 that produces an altered version of the MC1R protein. Red hair varies in hue from a deep burgundy or bright copper , or auburn , to burnt orange or red-orange to strawberry blond. Characterized by high levels of the reddish pigment pheomelanin and relatively low levels of the dark pigment eumelanin , it is associated with fair skin color , lighter eye color , freckles , and sensitivity to ultraviolet light.
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HIV and Gay and Bisexual Men | HIV by Group | HIV/AIDS | CDC

The hair-growth cycle is an example of a cyclic process that is well characterized morphologically but understood incompletely at the molecular level. As an initial step in discovering regulators in hair-follicle morphogenesis and cycling, we used DNA microarrays to profile mRNA expression in mouse back skin from eight representative time points. We developed a statistical algorithm to identify the set of genes expressed within skin that are associated specifically with the hair-growth cycle. The methodology takes advantage of higher replicate variance during asynchronous hair cycles in comparison with synchronous cycles. More than one-third of genes with detectable skin expression showed hair-cycle-related changes in expression, suggesting that many more genes may be associated with the hair-growth cycle than have been identified in the literature. By using a probabilistic clustering algorithm for replicated measurements, these genes were grouped into 30 time-course profile clusters, which fall into four major classes. Distinct genetic pathways were characteristic for the different time-course profile clusters, providing insights into the regulation of hair-follicle cycling and suggesting that this approach is useful for identifying hair follicle regulators.
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Why do some men have red beards, but not red hair?

Download and Share This Infographic image icon. Source: CDC. Taking HIV medicine every day can make the viral load undetectable. People who get and keep an undetectable viral load or stay virally suppressed can live a long and healthy life. These deaths could be from any cause.
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At Pacific, we are sensitive to the challenges students have faced this year and treat every admission application with care. University of the Pacific has defined and innovated what it means to deliver a comprehensive education since its founding. Whether your future is in engineering or music, business or health sciences, pharmacy or communications, sports management or law, computer science or pre-dentistry — Pacific has the program for you. Our community is among the most diverse in the nation. Our students are bright, determined, and above all else, in it together.
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