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(A) A molecular interaction network with 307 nodes and 1063 edges. (B) Abstract network with 311 nodes and 700 edges constructed by replacing the cliques in (A) with star-shaped subgraphs centered at dummy nodes, shown as red circles. (C) Abstract network with 74 nodes and 583 edges made by collapsing a group of nodes with the same interacting partners in (A) into composite nodes, shown as diamonds.
