Contact: Laura Udakis
Society for General Microbiology
Caption: Biophysicists at Yale created a method to stimulate single living cells with light and microparticles. Left side: The five particles pictured are trapped with laser tweezers and release a chemical which attracts the cell. Right side: The cell encounters a larger chemical concentration close to the particles (white-yellow region) than further away from the particles (red-black region).
Credit: Holger Kress and Eric Dufresne
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