Mouse spines (IMAGE) Keck School of Medicine of USC Caption The spine from a healthy mouse (left) and a mouse with genetically disrupted cartilage progenitor cells Credit Image by Dawei Geng and Tea Jashashvili Usage Restrictions none 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.