Time-lapse confocal movie showing movement of smooth muscle cells (red) and endothelial cells (green) in pillars in vitro. One confocal image was taken every 20 minutes for 20 hours. The movie shows movement in pillars without (control; left) or with (BB94; right) addition of matrix metalloproteinase (MMP) inhibitor BB94. MMP inhibition decreased movement of smooth muscle cells in pillars. The white lines at the end of the movie indicate how far smooth muscle cells migrate over 20 hours.
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