Cancer Cells (IMAGE) Proceedings of the National Academy of Sciences Caption Single cancer cells (red) encapsulated within nanoliter-scale drops show matrix metalloprotease activity (green). Credit PNAS 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.