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Cross-bridge cycling gives rise to spatiotemporal heterogeneity of dynamic subcellular mechanics in cardiac myocytes probed with atomic force microscopy Evren U. Azeloglu 1 ,2 and Kevin D. Costa 1 ,2 1 Department of Biomedical Engineering, Columbia University, and 2 Cardiovascular Research Center, Mount Sinai School of Medicine, New York, New York Submitted