WASHINGTON (Reuters) -- Rat cells grown onto microscopic silicon chips worked as tiny robots, perhaps a first step towards a self-assembling device, researchers working in the United States reported on Sunday.
They described a new method for attaching living cells to silicon chips. They then and got the combined entities to move like tiny, primitive legs.
http://www.cnn.com/2005/TECH/science/01/18/microbots.reut/index.html