Rejuvenated Muscle Tissue in Mice (IMAGE) University of California - Berkeley Caption A new study by University of California, Berkeley, found that older mice grew significantly more new muscle fibers, shown as pink "donut" shapes, after undergoing a procedure that effectively diluted the proteins in their blood plasma (bottom) than they did before they underwent the procedure (top). The research team is currently finalizing clinical trials to determine if a modified plasma exchange in humans could be used to treat age-associated diseases and improve the overall health of older people. Credit Image courtesy Irina Conboy Usage Restrictions with 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.