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The icosahedral geometry of a T = 1 capsid. (a) There are 60 symmetrically equivalent lattice positions, each one occupied by an asymmetric protein. For the 1stm virus, the protein positioned at 1 has bonds with those positioned at 2, 3, 6, 38, and 37 (but not with 4), with energies as shown in Table 1. (b) A flattened view of the icosahedron above.
