AKA g actin, this short polypeptide chain of 375 amino acids is the monomeric unit of the protein actin (one of the two proteins involved in muscle contraction). Many units of G actin join together in a polymer to make an actin filament.

From the BioTech Dictionary at http://biotech.icmb.utexas.edu/. For further information see the BioTech homenode.

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