Nanoparticles that secrete insulin as needed may someday relieve diabetics of the need to monitor their blood sugar. Researchers from North Carolina State University, the Massachusetts Institute of Technology, and Boston Children's Hospital found that the particles could be injected and effectively duplicate the function of pancreatic islet cells. "We’ve created a ‘smart’ system that is injected into the body and responds to changes in blood sugar by releasing insulin, effectively controlling blood-sugar levels," says Zhen Gu, an assistant professor of bioengineering at North Carolina State University.

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