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Change of rigidity as the assembly proceeds. (a) In T = 1 viruses, each cell in the icosahedral lattice (Fig. 1) accommodates one protein: here we show a 1stm monomer in its reduced description, as in Fig. 2 c. As the assembly proceeds, the rigidity of every oligomer is recalculated with FIRST from the full atomic data. The existence of intermolecular hydrogen bonds in the 1stm dimer (b) and trimer (c) modifies the rigidity of the constitutive monomeric units.
