Medical nanorobots. Computer illustration of nanorobots at work in a human blood vessel. The vessel contains red blood cells (red discs) and two types of white blood cell (transparent spheres and yellow objects). The robot at lower right has a drill to clear away any debris or clots that are blocking blood flow, while the other is injecting a drug into a cancerous or infected cell. Each nanorobot is powered by two small propellers.
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