Critical aspects of hierarchical protein folding
  We argue that the first order folding transitions of proteins observed at physiological chemical conditions end in a critical point for a given temperature and chemical potential of the surrounding water. We investigate this critical point using a hierarchical Hamiltonian and determine its universality class. This class differs qualitatively from those of other known models. 
Alex Hansen, Mogens H. Jensen, Kim Sneppen and Giovanni Zocchi