We created this animation to explain some of the background and concept behind Microsoft Research‘s DNA Strand Displacement tool (DSD),
It was created for Microsoft Research to use at Techfest, to explain the mechanics of DNA strand displacement, and show how their tool enables the design and simulation of programmable DNA circuits for biological computation.
More information, including the current beta version of the software here:
http://research.microsoft.com/en-us/projects/dna/