Brain and DNA (IMAGE) University of California - Santa Barbara Caption Differences in gene expression, not just their presence, seems to drive the remarkable specialization found in the human brain. Credit Matt Perko Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. No derivatives or adaptations of the work are permitted. License CC BY-NC-ND 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.