3D View of An Aster (IMAGE) California Institute of Technology Caption A three-dimensional look at an aster, a structure composed of tiny protein filaments that have been engineered to be controlled with light. Credit Caltech Usage Restrictions Must use image credit 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.