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Close view of the stretch phase in the experiment shown in figure 4. (a) Force trace and superimposed length records for individual sarcomeres. The Fc in this myofibril was 1.92 times the isometric force produced before stretch, and the force at the end of stretch was 3.16 times the isometric force. (b) The average critical SL in this myofibril was 15.5 nm hs−1.
