micrometer-long tracks made of a protein called fibronectin. The movies were then sent to the French team for analysis. By the end of the competition, the researchers had tracked 10,
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,127 cells of 58 different types in 771 movies.

The team noticed trends in the ways cells move. Some cells creep straight along the track and don’t change direction. Other cells changed direction often. The number of cells within a population that move varies from cell type to cell type. Cells from a dozen different entries didn’t move at all. But among the movers,
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, the researchers found that “cells that move fast do not change direction very much,
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,” Piel said. “Slow cells change direction a lot.”

The finding is a core property of cell migration that researchers might never have learned about if not for the direct comparison of many cell types at once,
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, Théry says.

Piel announced the winners December 3 at this year’s annual meeting of the American Society for Cell Biology.

Easily taking first prize were human fetal mesenchymal stem cells,
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, submitted by Yuchun ?Liu of the National University of Singapore. Clocked at 5.2 micrometers (also called microns) per minute, the cells,
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, which were isolated from bone marrow,
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, crossed the finish line far ahead of the nearest competitor. Extreme mobility may be another characteristic of stem cells that set them apart from mature cells and a feature that stem cells share with cancer cells,
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, Théry said.

Second place went to breast epithelial cells submitted by Odile Filhol-Cochet, who also comes from the iRTSV

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