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| Actins F-Actin | G-Actin | Actin | Isoactin | N-Actin | alpha-Actin | alpha-Isoactin | beta-Actin | gamma-Actin | F Actin | G Actin | N Actin | alpha Actin | alpha Isoactin | beta Actin | gamma Actin Filamentous proteins that are the main constituent of the thin filaments of muscle fibers. The filaments (known also as filamentous or F-actin) can be dissociated into their globular subunits; each subunit is composed of a single polypeptide 375 amino acids long. This is known as globular or G-actin. In conjunction with MYOSINS, actin is responsible for the contraction and relaxation of muscle. | |
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