# T=75 icosahedral carboxysome

**T=75 icosahedral carboxysome** is composed of 12 pentameric and 740 hexameric capsomeres for a total of 4500 carboxysome proteins.

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