- A Troponin
- B ATPase
- C Tropomyosin
- D LMM
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The thin filament or actin filament is primarily composed of two filaments of ‘F’ actin wound helically around each other. ‘F’ actin is a polymer of monomeric ‘G’ actins. The proteins tropomyosin and troponin are also present and are important regulatory proteins that control muscle contraction.
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