(a) 3D illustration of the icosahedral capsid of CPMV. (b) Flattened layout of the icosahedral capsid. The yellow triangles in (a) and (b) represent the same surface. (c) Two types of proteins (red and blue) that form one of the 60 units (black dashed triangle), as shown in (b). The figures were obtained from VIPERdb (https://viperdb.scripps.edu) (Montiel-Garcia et al., 2021).