Before revision:  The question of the characterization and emergence of modularity following principles of evolution remains an important challenge as there is no encompassing theory to explain the resulting modular topology. Here, we perform an empirical study of the yeast protein-interaction network . We find a novel large-scale URLanization of the functional classes of proteins characterized in terms of scale-invariant laws of modularity.
After revision:  The question of the functional understanding of cells. In the last years, large-scale URLanization of the functional classes of proteins characterized in terms of scale-invariant laws of modularity.