Twist1 Induces Cellular Migration (image) Johns Hopkins Medicine Caption Normal epithelial cells (red) in this fragment of a mouse mammary duct form branched structures. However, cells that turn on the gene Twist1 (green) detach from neighboring cells and migrate into the surrounding environment. Credit Eliah Shamir Usage Restrictions None 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.