Microrobots treat lung metastasis - SEM (IMAGE) University of California - San Diego Caption Colored SEM image of a microrobot made of an algae cell (green) covered with drug-filled nanoparticles (orange) coated with red blood cell membranes. Scale bar: 2 µm. Credit Zhengxing Li Usage Restrictions Please credit: Zhengxing Li 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.