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.