POWER AND SYRED / SCIENCE PHOTO LIBRARY POWER AND SYRED / SCIENCE PHOTO LIBRARY
Human hair, coloured scanning electron micrograph (SEM). The shafts of hair (yellow) are anchored in their individual hair follicles (not seen) below the surface of the skin. The outside of the hair, the cuticle, is covered in overlapping scales of dead cells containing the protein keratin. Magnification: x264 when printed 10 centimetres wide.
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