Velcro for Human Cells (IMAGE) University of Freiburg Caption The OptoMatrix-OptoIntegrin system: OptoIntegrin-expressing cancer cells are seen adhering to the OptoMatrix, but only to the part illuminated with red (660nm) light. Credit Photo: J. Baaske Usage Restrictions None 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.