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Figure 1: A 7 micron yeast cell is collided with a two-cell conglomerate using the dual-beam infrared tweezers. The deformation of the cell membranes can be seen in the second frame.

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Figure 2: A 3 micron polystyrene sphere and a 5 micron sphere are collided with the dual-beam tweezers. Given this controlled contact, experiments can be designed to measure sticking forces and binding forces.

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