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Troponin is a part of filament....

Troponin is a part of _____filament.

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**Step-by-Step Text Solution:** 1. **Understanding Troponin**: Troponin is a protein that plays a crucial role in muscle contraction. It is specifically associated with muscle fibers. 2. **Identifying the Type of Filament**: Troponin is a component of the thin filament in muscle tissue. Thin filaments are primarily composed of actin, along with troponin and tropomyosin. 3. **Location of Troponin**: Troponin is found in skeletal muscle fibers. It is important to note that troponin is absent in smooth and cardiac muscle fibers. 4. **Composition of Troponin**: Troponin itself consists of three subunits, which are: - TnC (Troponin C): Binds calcium ions. - TnT (Troponin T): Binds to tropomyosin. - TnI (Troponin I): Inhibits actin-myosin interactions. 5. **Conclusion**: Therefore, the answer to the question "Troponin is a part of _____ filament" is that troponin is a part of the **thin filament**. ---
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