FRANK FOX / SCIENCE PHOTO LIBRARY FRANK FOX / SCIENCE PHOTO LIBRARY
Human hair. Darkfield illuminated light micrograph of a strand of human hair. 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: x280, when printed 10 centimetres wide.
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