» For the leaf bug, see Miridae. A capsid's the protein shell of a virus. It consists of several oligomeric structural subunits made of protein called protomers. The 3-dimensional morphological subunits that can be observed, which may or may not correspond to individual proteins, are called capsomeres. The capsid encloses the genetic material of the virus. Capsids are broadly classified according to their structure. The majority of viruses have capsids with either helical or icosahedral structu… (More on Capsid)