Figure 1.

Illustration of a directed network and the hubs within this network. Left: The nodes are labeled with the hubdegree of the outflow (counting the arrow tails), Right: The nodes are labeled with the hubdegree of the inflow (counting the arrow heads).

Schlee et al. BMC Biology 2009 7:80   doi:10.1186/1741-7007-7-80
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