Old muscles heal faster when they're exposed to young blood. That's the conclusion of a recent experiment in mice, led by Stanford University neurologist Thomas Rando. His team found that blood from younger mice stimulated stem cells in the muscles and livers of older mice. Those are the cells that generate new tissue. It's not clear what part of the young blood makes the difference, but Dr. Rando suspects it's a combination of factors. If scientists can solve the mystery, they may be able to develop new ways to help injuries and broken bones heal more quickly. This Science Update looks at the research, which leads to these findings and offers links to other resources for further inquiry. There are also links to Science Netlinks Lesson plans for use at the 6-8 grade level.


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