to place and zero tokens are assigned to place . The two places are connected by a transition, . The arcs in and out of indicate the direction in which tokens move. When fires, it moves some number of tokens from and puts them in . In (b), transition has fired and moved two tokens from to .<p><b>Copyright information:</b></p><p>Taken from "Rapidly exploring structural and dynamic properties of signaling networks using PathwayOracle"</p><p>http://www.biomedcentral.com/1752-0509/2/76</p><p>BMC Systems Biology 2008;2():76-76.</p><p>Published online 19 Aug 2008</p><p>PMCID:PMC2527501.</p><p></p
