Figure 2 (IMAGE) Kanazawa University Caption Ncad distribution visualizes the regular arrangement of the donut-like columnar structures in the developing fly brain. Credit Kanazawa University Usage Restrictions The image may only be used with appropriate caption and credit. 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.