Twist changes (IMAGE) City University of Hong Kong Caption Effects of twist changes on gene expression. Overwinding suppresses gene expression, while unwinding promotes gene expression. Credit Dr Dai Liang Usage Restrictions Image must be used with appropriate caption and credit. 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.