The three proteins found to make up the thin filaments are actin, tropomyosin, and

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Troponin, along with actin and tropomyosin, is one of the three proteins that make up the thin filaments in muscle cells. Actin provides the backbone of the filament, tropomyosin covers the active sites on actin at rest, and troponin binds to actin, tropomyosin, and calcium ions, playing a crucial role in muscle contraction regulation.

The Three Proteins Found to Make Up the Thin Filaments