Actin exists in two forms, namely, monomers and polymers. Actin monomer is a polypeptide chain consisting of spherical molecules, also known as globular actin (globular actin, G-actin), shaped like a peanut. Actin polymer’s formation is actin filaments which is called fibrous actin (fibros actin, F-actin). In the electron microscope, F-actin was double-stranded helical diameter of 8nm, the distance between spirals 37nm. Actin in eukaryotic cells is the most abundant proteins. In muscle cells, actin 10% of the total protein, even in non-muscle cells, actin is also accounted for the total cellular protein 1 to 5%.
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