VOLKER STEGER / SCIENCE PHOTO LIBRARY VOLKER STEGER / SCIENCE PHOTO LIBRARY
Cat hairs. Coloured scanning electron micrograph (SEM) of cat hairs from household dust. Cat hair is a common cause of human allergies, causing irritation to the eyes, noses and respiratory tracts of susceptible people. Each hair shaft has an outer cuticle made up of flat overlapping scales or plates, thought to prevent the hairs from matting together. Hair is largely composed of the protein keratin. Magnification unknown.
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