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Volume 204 Issue 2, 26 January 2008

'Coloured scanning electron micrograph (SEM) of a freeze fracture through tooth enamel. The enamel is the outer covering of the crown (visible part) of the tooth. It is the hardest substance in the human body. It is composed of rows of calcium phosphorous salts (light brown) embedded in a protein matrix (darker brown).' COVER IMAGE STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

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