Actually, these bristles are usually made of chitin, the same polysacchride that the exoskeletons of insects and other arthropods are made of. Mammilian hair shafts, on the other hand, is mostly made of keratinized cells, with a few pigments that determine the color. Interestingly, each hair on the skin of a mammal, including humans, has its own arrector muscle that can cause it to stand on end!
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