STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Human hairs. Coloured scanning electron micrograph (SEM) of human hairs. Hairs are made up of dead tissue. The outside of the hair, the cuticle, is covered in overlapping scales that protect the hair's central cortex, which is made up of the fibrous protein keratin. Magnification: x56 when printed 10 centimetres wide.
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