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F-actin and its associated proteins
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Description
Panel (a): This schematic drawing shows the proteins present in the
thin filaments of striated muscle: F-actin, tropomyosin, and troponins (Tn) I, C, and T.

Panel (b): Crystal
structure of a fragment of rat skeletal tropomyosin showing the coiled coil (PDB ID: 2B9C).

Panel (C): The
troponin complex from chicken skeletal muscle (PDB ID: 1YTZ). TnI is shown in yellow, TnT in orange and
TnC in red with four bound Ca2+ ions shown as blue spheres.
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