Eicosameric refers to biological polymers or multimers having exactly twenty 'monomers' (or 20 repeating components). Protein complexes having exactly 20 subunits are referred to as eicosameric (or sometimes 20-Meric). Examples of eicosameric protein complexes include; The rat GTPCHI/GFRP stimulatory complex (involved in regulating sub cellular signalling cascades) See also Protein quaternary structure External links The Macromolecular Structure Database (MSD) at the European Bioinformatics Institute (EBI) serves a list of the Probabable Quaternary Structure (PQS) for every protein in the Protein Data Bank (PDB). The Protein Interfaces, Surfaces and Assemblies (Pisa) server at the MSD. Protein structure Polymers