James Godwin, Ph.D. (IMAGE) MDI Biological Laboratory Caption In a study that builds on earlier research that identified macrophages as essential to regeneration in the axolotl, a highly regenerative salamander, James Godwin, Ph.D., a scientist at the MDI Biological Laboratory in Bar Harbor, Maine, has identified the source of these critical white blood cells as the liver. By giving scientists a place to look for pro-regenerative macrophages in humans, the discovery brings science a step closer to the ability to regenerate tissues and organs lost to injury or disease. Credit MDI Biological Laboratory 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.