Neurons Expressing Topoisomerase-1 (IMAGE) University of North Carolina Health Care Caption This image shows neurons expressing the Topoisomerase-1 gene, in green. Credit Angela Mabb Usage Restrictions None 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.