Mice Muscle Repair (image) Carnegie Institution Caption This cross section of hind limb muscle tissue is from a mouse five days after injury. The uninjured cells are at top and stained red. The blue cells below are regenerating muscles cells. They were labeled with a blue stain and formed from muscle stem cells. Credit Christoph Lepper Usage Restrictions Clear with Lepper 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.