Fruit Fly Head (IMAGE) University of California - Santa Barbara Caption Left: The rectangle indicates a portion of the fruit fly brain (below the cuticle) with the pacemaker cells that express Rh7. Right: One part of the fly brain with circadian pacemaker cells that express Rh7 with a colorful depiction of Rh7 on the right. Credit Peter Allen and Jinfei Ni 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.