Over the summer, competitors shipped their cell lines to labs in Boston, London, Heidelberg, Paris, San Francisco, and Singapore, where they were thawed and placed in specially designed well plates containing cell race tracks, according to the competition rules. The tracks were actually 400-micron micropatterned plates that were coated with fibronectin tracks to attract the cells, and surrounded by material that repels them. The cell nuclei were stained so that digital cameras could watch them move for the next 24 hours, monitoring their progress across the official race distance — about 100 µm, or about the width of a human hair. The first ones to reach the end of the track were the winners. The camera images were stitched together into time-lapse videos.