Image Gallery: Micromachines
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Grain of Pollen and Red Blood Cells
http//img188.imagevenue.com/aAfkjfp01fo1i-15551/loc354/41354_ig04_engines_cells_02_122_354lo.jpg
Drive gear chain and linkages, with a grain of pollen (top right) and coagulated red blood cells (lower right, top left) to demonstrate scale.
More here http//www.livescience.com/php/multimedia/imagegallery/igviewer.php?imgid=53&gid=6&index=0