JOHN BURBIDGE / SCIENCE PHOTO LIBRARY JOHN BURBIDGE / SCIENCE PHOTO LIBRARY
Light micrograph of a section through a human hair. The hair shaft consists of three layers: the medulla (centre), which may be hollow; the cortex (blue), a keratinised layer forming the bulk of hair and containing the pigment which gives the hair its colour; and the cuticle (white), a hard, thin layer on the surface of the hair. Magnification: x200 at 6x6 cm size, x100 at 35mm size.
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