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Figure 5
Modelling of the structure of thin (actin) filaments from frog skeletal muscle using the atomic data. Troponin molecules are omitted (see text). (a) A resting model. (b) A contracting model. In each, the upper is a perspective view with the pointed end upward and the lower is a cross-sectional view. The subdomains (1–4) of an actin monomer are shown in different colours. The tropomyosin molecule is indicated by TM. During contraction the direction of movement of each subdomain in actin is denoted by an arrow. The numerical values represent a magnitude of movement.

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