ESA/NASA Hubble Space Telescope image
Recently, nanotech researchers from Europe have reported a primitive working nanomanufacturing system. It uses proteins walking along nanotubes like this. Eukaryotic cells(as opposed to bacterial cells) have these microtubules coming out of their inner cell membrane that houses the dna. The microtubules also gives the cell a certain amount of rigidity.
I had posted "Lives of a Cell" pretty early on in this blog; that particular youtube has been taken down. I'm sure one can find another youtube of the lives of a cell. The youtube above is similar.