CLOCK Migration (IMAGE) UT Southwestern Medical Center Caption This cluster of human neurons grown in culture shows red cells with altered CLOCK levels migrating farther than control green cells. The image is part of a study demonstrating that a gene controlling our biological clocks also plays a vital role in regulating human-specific genes important to brain evolution. Credit UTSW 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.