A unifying motif of intermolecular cooperativity in protein associations S.R. Accordino, J.A. Rodriguez Fris, G.A. Appignanesi and A. Fernández Eur. Phys. J. E, 35 7 (2012) 59 Published online: 16 July 2012 DOI: 10.1140/epje/i2012-12059-0