Hair is a protein filament that grows from follicles in the skin of humans and animals. It's a defining characteristic of mammals, and is made up of dead cells filled with keratin. Hair has two main parts: the hair shaft, which is the visible part of the hair, and the hair root, which is in the skin. The hair root is surrounded by the hair follicle, a sheath of skin and connective tissue. Hair can be straight, curly, brown, gray, or dark red. Most mammals have hair.
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