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Evidence for the additions of clustered interacting nodes during the evolution of protein interaction networks from network motifs

Zhongyang Liu, Qijun Liu, Hanchang Sun, Lin Hou, Hao Guo, Yunping Zhu*, Dong Li* and Fuchu He*

BMC Evolutionary Biology 2011, 11:133  doi:10.1186/1471-2148-11-133