Figure 4From: Estimation of the number of extreme pathways for metabolic networksConnectivity of Reactions. Diagram describing different types of connectivities. Reaction r i utilizes metabolite A, which is produced by three reactions, and produces metabolite B, which is consumed by three reactions. Reaction r i then has an incoming degree of d-(r i ) = 3 due to metabolite A, and outgoing degree of d+(r i ) = 3.Back to article page