Closeup of a completed respirocyte, in an unusual pose with the equatorial belt running vertically. The artificial respirocyte is a hollow, spherical medical nanorobot exactly 1 micron in diameter. This nanomachine is built of 18 billion precisely arranged structural atoms, and holds an additional 9 billion molecules when it is fully loaded with gas, fuel, and water. Four pumping stations, of a total of twelve, are partly or completely visible in the image.