Synonym for globular actin ... <protein> A short polypeptide chain of 375 amino acids which 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. ... (09 Oct 1997) ... 
Globular actin.
Type: Term Definitions: 1. the globular (G) subunit of the actin molecule, having a molecular weight 42 kD; it is soluble in dilute salt, polymerizing to F-actin when the ionic strength is increased.