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Snail radula. Coloured scanning electron micrograph (SEM) of the surface of the radula of a snail. The radula is a tongue-like organ found in molluscs. It is studded with rows of horny teeth, which are used to rasp food particles from surfaces. Magnification: x1460 at 6x7cm size. (KEYSTONE/SCIENCE PHOTO LIBRARY/CLOUDS HILL IMAGING LTD)