Michael A. Rudnicki is at the Ottawa Health Research Institute, Molecular Medicine Program, 501 Smyth Road, Ottawa, Ontario K1H 8L6, Canada. mrudnicki@ohri.ca
Bone marrow cells can reconstitute muscle, but which cells contribute to the process, and how do they do it? Two studies trace the journey of a single hematopoietic stem cell into muscle tissue (pages 1520−1527 and 1528−1532).
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