Wistar Institute's Dr. Hildegund Ertl (IMAGE) The Wistar Institute Caption Wistar Institute's Dr. Hildegund Ertl Credit Wistar Institute Usage Restrictions N/A License Original 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.