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Representative skinned myocardial preparation (dimensions: 430 μm w 174 μm) while relaxed (A, pCa 9.0) and during maximal activation (B, pCa 4.5). Sarcomere length in pCa 9.0 and 4.5 was 2.35 and 2.27 μm, respectively. Scale bar represents 50 μm.
