Bend-And-Roll Behavior (video) The Zuckerman Institute at Columbia University Share Print E-Mail Loading video... Caption A fruit fly performs the bend-and-roll escape behavioral sequence. In this study, scientists identified a class of nerve cells, called down-and-back neurons, that initiate this behavior in response to dangerous stimuli. Credit Anita Burgos/Grueber Lab/Columbia's Zuckerman Institute Usage Restrictions Please contact Zuckerman Institute for reprint permissions. Share Print E-Mail 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.