Analysis of the network growth model analogous to the ones in Figures 3 and 4. (Top panel) Decay in organism degree (OD) as a function of distance from the most central node. (Bottom panel) The likelihood of finding two reaction nodes of the same OD k steps apart.
Bernhardsson et al. BMC Evolutionary Biology 2011 11:20 doi:10.1186/1471-2148-11-20