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. 2016 Feb 10;6:20674. doi: 10.1038/srep20674

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Copyright © 2016, Macmillan Publishers Limited

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Approximately 30 min after the start of stretch, one myofibril increased its length through end addition of sarcomeres. During a 120-min period, four new sarcomeres were added. At approximately 100 min, the middle of the myofibril broke, and two new sarcomeres inserted during a 90-min period. At approximately 230 min, the myofibril broke again the same site. Scale bars: 20 μm.