Birch Pollen (IMAGE) Technical University of Munich (TUM) Caption This is an electron-microscopical image of a birch pollen Credit I. Weichenmeier/ZAUM Usage Restrictions Free for use in reporting on TU Muenchen, with the copyright noted 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.