T=2 icosahedral capsid protein (kw:KW-1141)
The T=2* symmetry is an nonofficial appellation, to be rigorous the capsid has a T=1 symmetry with each unit composed of a homodimer.

Icosahedric triangulation number is calculated following Caspar and Klug system
Physical principles in the construction of regular viruses
D. L. Caspar, A. Klug
Cold Spring Harb. Symp. Quant. Biol. 1962; 27: 1?24
D. L. Caspar, A. Klug
Cold Spring Harb. Symp. Quant. Biol. 1962; 27: 1?24
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