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Red blood cells are go! Physicists in India have shown that red blood cells can transfer the angular momentum in a circularly polarized laser beam into rotational motion. The "motor" developed by Deepak Mathur and colleagues at the Tata Institute of Fundamental Research (TIFR) in Mumbai could find use in a variety of applications, including biosensors and cellular micromachines (J A Dharmadhikari et al. 2004 Appl. Phys. Lett. 85 6048).
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