Science image (IMAGE) Salk Institute Caption When genetic mutations cause chromosomes to break apart and fuse together in different ways, normal cells can become cancerous. In this image, normal chromosomes (blue) are shown with chromosomes (green and red) that have been altered using CRISPR-Cas9 genome engineering and fused back together. Credit Salk Institute Usage Restrictions with credit and related coverage. 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.