DNA engine observed in real-time traveling along base pair track

http://www.physorg.com/news/2011-02-dna-real-time-base-pair-track.html

"Resembling a monorail train, the system relies on the self-assembly properties of DNA origami and consists of a 100 nm track together with a motor and fuel. Using atomic force microscopy (AFM), the research team was able to observe in real time as this motor traveled the full length of the track at a constant average speed of around 0.1 nm/s."