Additional File 6.

A graph demonstrating the scale-free topology of relationship networks derived from the biological literature. The network contains 138 nodes and 1912 relationships. A small fraction of the nodes (10 nodes colored in black) accounted for more than 45% of the relationships (solid lines), a characteristic of scale-free topology.

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Chen and Sharp BMC Bioinformatics 2004 5:147   doi:10.1186/1471-2105-5-147