Tropomyosin's periods are quasi-equivalent for actin binding but have specific regulatory functions.

Abstract excerpt

Tropomyosin is a coiled coil that associates N-terminus to C-terminus to form a continuous strand along both sides of the actin filament and regulates its function. One long, high molecular weight tropomyosin molecule spans the length of seven actin subunits. In these forms there is a 7-fold periodicity in noninterface residues that have been proposed to correspond to seven quasi-equivalent actin binding sites....

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