Actin is a key player in muscle contraction, forming the thin filaments within the sarcomere. These filaments are made up of G-actin units that link together to create a long, helical strand called F-actin. This helical structure gives the filament its flexibility and strength, allowing it to withstand the forces generated during muscle contraction. Each G-actin unit has a binding site for myosin, making the actin filament a track along which myosin heads can move to create muscle shortening. Th
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