Healthy and Cancerous Cell Nuclei (IMAGE) Rice University Caption The green spots in these images are cell nuclei treated with a fluorescent dye. The cells are from the oral cavity of cancer patients. In healthy tissue (top), the nuclei are small and widely spaced. The nuclei of cancer cells (bottom) are abnormally large and close together. Credit D. Shin/Rice University 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.