 CCMV is composed of an icosahedral protein capsid (T=3) that is 28 nm in diameter.This capsid is constructed by 180 identical protein subunits each with a primary structure of 190 amino acid residues.There are three subunits are distributed over the virus coat, A, B, and C. The A subunits are arranged in pentamers and the B and C subunits are together arranged in hexamers.