Biodegradable microspheres (IMAGE) University of Konstanz Caption Biodegradable microspheres that are produced via spray drying. They contain an influenza virus antigen and an immunostimulating substance. The image was obtained by electron microscopy, enlarged 3,000 times. Copyright: Dennis Horvath, University of Konstanz Credit Dennis Horvath, University of Konstanz Usage Restrictions use the image only with Copyright: Dennis Horvath, University of Konstanz 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.