STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Hairs on the scalp. Coloured light micrograph showing the underlying structure of hair follicles on a human head. 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: x50 when printed 10cm tall.
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