Cells on Nanoneedle Image (IMAGE) Imperial College London Caption The image shows human cells (green) on the nanoneedles (orange), which has DNA injected into the cells' nuclei (Blue). The image was taken by the researchers using optical microscopy. Credit Imperial College London 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.