NTRAIN device (IMAGE) Rice University Caption A close-up of the NTRAIN implant shows its internal cellular factories, which, when activated by light, produce precisely dosed peptide therapies. The device keeps the cellular factories tightly enclosed, only allowing the therapies to diffuse into the body. Credit Image courtesy of Northwestern University Usage Restrictions Must credit: "Northwestern University" License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.