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Figure 1 | BMC Systems Biology

Figure 1

From: Rapidly exploring structural and dynamic properties of signaling networks using PathwayOracle

Figure 1

An example of how tokens move among places. In a Petri net, quantities of tokens are assigned to places. In (a), three tokens are assigned to place p A and zero tokens are assigned to place p B . The two places are connected by a transition, t1. The arcs in and out of t1 indicate the direction in which tokens move. When t1 fires, it moves some number of tokens from p A and puts them in p B . In (b), transition t1 has fired and moved two tokens from p A to p B .

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