Networks between Professionals and Society: A Model for Protein   Dependency
  We propose a network model with a fixed number of nodes and links with a dynamics which favors links between nodes differing in connectivity. Parameter regimes where the degree distributions follow power-laws, P(k) ~ k^-gamma, high clustering following C(N) ~ 1/N and small-world properties, with a network diameter following D(N) ~ A+ B log N, are observed. Our model gives results comparable with real-world protein networks. 
Henning Frydenlund Hansen and Alex Hansen