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Microsphere filter particles. Scanning electron micrograph (SEM) of propranolol-imprinted polymer microspheres. Propranolol is a steroid drug used to treat hypertension, anxiety and panic. These microscopic spheres have been chemically treated to bind to propranolol as a means of removing it from drinking water. Magnification: x2300 when printed 10 centimetres wide.
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