Microgears. Coloured scanning electron micrograph (SEM) of an interlocking array of micromotor gears. Tiny gears and cogs such as these are the basis of designing tiny machines. It is hoped that machines will be small enough to travel freely in the human body, to deliver drugs at specific sites or to attack and destroy tumour cells or invading pathogenic organisms such as bacteria. Magnification: x200 at 5.5x5.5cm size.
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