The capsid is composed 60 asymmetric units made of 43 protein (T=43), for a total of 2580 capsid proteins.

Icosahedric triangulation number is calculated following Caspar and Klug system

Viral molecular biology Virion
Virus entry
Transcription and replication
Host-virus interactions
Virus exit
Icosahedric capsids Virus symmetry and T number
T=1
T=2*
T=3
T=pseudo3
T=4
T=7
T=9
T=13
T=16
T=21
T=25
T=27
T=28
T=31
T=43
T=75 bacterial carboxysome
Virus dsDNA
Portogloboviridae