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We may think we know everything about hair. It seems to be very much alive, sensitive to our moods or the vagaries of the weather. And yet the part of it we see, the fibre, is a material which is biologically dead. It is under the epidermis, in the root, that the vibrant life is going on, where the hair is made as the result of complex and ceaseless chemical and biological reactions., initiated at the very start of embryonic life.
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