TEM View (IMAGE) Duke University Caption This is an image of the newly repackaged pharmaceutical under a transmission electron microscope. The dark spots are the water-insoluble cores of the nanoparticles, while the peptide chains are barely visible due to their low electron density and high degree of hydration. Credit Ashutosh Chilkoti, Duke University Usage Restrictions None 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.