Newly Grown Enamel (IMAGE) University of Southern California Caption This is a scanning electron microscope image of newly grown enamel using amelogenin-chitosan hydrogel. Credit Herman Ostrow School of Dentistry of USC 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.