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(A) Histogram showing distribution of the shortest path. Two randomly selected nodes were connected via 2.85 links; (B) The small (simplified) network of the Protein-Protein Interactions (PPIs) of azoospermia. The identified important nodes and their interconnected nodes were extracted to construct a new small PPI network. This new network consists of 46 nodes and 157 links. The key nodes are highlighted in yellow.
