Degree distributions of (a) complex-mode projection (complex-complex network) and (b) proteins-mode projection (protein-protein network). Here, the degree in (a) corresponds to the number of complexes which share at least one component protein with each complex, and the degree (b) corresponds to the number of proteins which participate in at least one complex with each protein. The blue squares correspond to the cumulative degree distribution P(k) = ∑k′ ≥ k p(k′). The pink lines and gray curves are the best exponential and power-law fittings, respectively.
Lee et al. BMC Systems Biology 2011 5:126 doi:10.1186/1752-0509-5-126