(VIDEO) Hong Kong University of Science and Technology This video is under embargo. Please login to access this video. Caption The video shows the secretion of sonic hedgehog in a synchronized manner using a Retention Using Selective Hooks (RUSH) transport assay. Credit HKUST Usage Restrictions N/A License Original 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.