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Changes in skeletal troponin C (sTnC) structure during thin filament activation by Ca2+ and strongly bound cross-bridge states were monitored by measuring the linear dichroism of the 5′ isomer of iodoacetamidotetramethylrhodamine (5′IATR), attached to Cys98 (sTnC-5′ATR), in sTnC-5′ATR reconstituted single skinned fibers from rabbit psoas muscle. To isolate the effects of Ca2+ and cross-bridge binding...