Six respirocytes are shown tumbling at various rotations, showing the equatorial band of water-molecule sorting rotors with side arms of oxygen and carbon dioxide sorting rotors, comprising each of the 12 equatorial pumping stations. Device diameter is exactly 1 micron.
Robert A. Freitas Jr., “Respirocytes: High Performance Artificial Nanotechnology Red Blood Cells,” NanoTechnology Magazine 2 (October 1996): 1, 8-13 (8).