The twenty-four near-instabilities of Caspar-Klug viruses
  Group theoretical arguments combined with normal mode analysis techniques are applied to a coarse-grained approximation of icosahedral viral capsids which incorporates areas of variable flexibility. This highlights a remarkable structure of the low-frequency spectrum in this approximation, namely the existence of a plateau of 24 near zero-modes with universal group theory content. 
Fran\c{c}ois Englert, Kasper Peeters and Anne Taormina