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'In a major breakthrough for the field of nanomedicine researchers have developed tiny autonomous robots that can shrink cancer tumors by cutting off their blood supply. Scientists from Arizona State University and China’s National Center for Nanoscience and Technology programmed tiny robots to carry payloads of a blood-clotting enzyme to tumor-associated blood vessels in mice.This special payload on each bot’s surface directs it toward a protein called nucleolin-- not found on the surface of healthy cells-- and is nly generated in large amounts on the surface of tumor endothelial cells. This is an extremely important aspect of this experiment because thrombin could be dangerous if delivered elsewhere in the body. The researchers have only tested their nanobots in mice and Bama miniature pigs, but in both cases, the bots proved to be safe and effective at shrinking tumors.'