NANO-ASSEMBLY LINE. “But Gu’s robot isn’t alone. It’s accompanied by three more DNA ‘loading’ machines, each carrying a different cargo of gold particles – a small 5-nanometre one, a pair of these, and a large(r) 10-nanometre one. By tweaking the settings of the loaders, Gu can create eight possible products, forged of a combination of the three types of gold particles.”
http://science.sciencemag.org/content/345/6198/795