When muscle cells undergo injury, quiescent satellite cells are released from beneath the basement membrane. They become activated and re-enter the cell cycle. These dividing cells are known as the "transit amplifying pool" before undergoing myogenic differentiation to form new (post-mitotic) myotubes. There is also evidence suggesting that these cells are capable of fusing with existing myofibres to facilitate growth and repair.
Text Source: http://en.wikipedia.org/wiki/Satellite_cell
Image Source: http://www.sfn-manitoba.ca/profiles/anderson/muscles.jpg
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