Alexis Bretin (IMAGE) Georgia State University Caption Alexis Bretin, lead author of the study and a postdoctoral fellow in the Institute for Biomedical Sciences at Georgia State University Credit Georgia State University 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.