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Discover the intricate world of hair with a Yale researcher. Explore the science of hair growth, stem cells, genetic influences, varying hair types, and the importance of hair in animals. Delve into the biology of hair follicles, the role of melanin in coloration, and the fascinating parallels between nails and hair growth.
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- Hair is composed of medulla, cortex, and cuticle, with vellus and terminal types, playing key roles in body protection and temperature regulation.
- Stem cells drive hair growth and color, affected by stress, with nails having unique growth rates and stem cell properties.
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Hair Structure and Growth Cycles
Hair is composed of three main parts: the medulla, cortex, and cuticle. The medulla is the innermost part, the cortex contains keratin and pigments giving color, and the cuticle acts as a protective barrier. There are two main types of hair: vellus hair, fine and barely visible, and terminal hair, thicker and more visible. Hair growth cycles determine how long hair can grow and its regrowth process.
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