MBI YT Amnioserosa (1 of 2) (IMAGE) National University of Singapore Caption Image of a fruit fly embryo undergoing a process called dorsal closure. The polygon shaped cells undergo dynamic shape changes as they "zip up" to seal the embryo, making these cells ideal for studying cell boundary elongation and contraction. Cell boundaries are labelled with a fluorescent protein (blue-green). Credit Mechanobiology Institute, National University of Singapore Usage Restrictions Credit image accordingly. 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.