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) PDB: 1is7​

• Protein quaternary structure

• 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.

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