Developing Muscle in a Mouse Leg (IMAGE) Sanford Burnham Prebys Caption Muscle stem cells both generate new muscle (shown here in green) and regenerate it after damage. Credit Laboratory of Alessandra Sacco Usage Restrictions Free to use in conjunction with this press release only, using the provided caption and credit. 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.