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Subject - Biochemistry, Cell Biology
Actin is the main component of thin muscle filaments. It is found in two forms: monomeric G-actin (globular actin) and F-actin (filamentous actin), which results from the polymerization of G-actin to a helix made of two strands. Interaction of the actin filaments with myosin ATPase produces muscle movement.
In nonmuscle cells, some of the actin is polymerized into microfilaments and is an important component of the cytoskeleton.
See also: cytoskeleton
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Cytology is introduced by means of illustrations, animations, and a comprehensive collection of references and selected links.