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. 2014 Aug 29;9(8):e105842. doi: 10.1371/journal.pone.0105842

Figure 2. A directed acyclic network.

Figure 2

Controlling all three source nodes (nodes 1, 2 and 3) guarantees full control of the network, but are ineffective when targeted individually. The best single node to control in this network is node 6 because it directly controls all downstream nodes.