Figure 6
From: Preferential attachment in the evolution of metabolic networks
Connectivity of HGT and non-HGT enzymes. The proportion of the number of enzymes in each connectivity group is plotted against the binned connectivities for the enzymes which are candidates for horizontal gene transfer (white bars) and enzymes which are not candidates for HGT (black bars). The results are shown for the network where the 15 most promiscuous compounds had been removed.