Figure 2
From: An evaluation of minimal cellular functions to sustain a bacterial cell
Reconstruction of the metabolic network from chemical reactions. (a) Chemical reactions in the binary relation with reversible/irreversible information (arrows). (b) The reconstructed network using chemical reactions in (a). Enclosed characters indicate the initial substrates. (c) The reconstructed network using chemical reactions in (a) and E ↔ F. (d) The reconstructed network from the chemical reactions A + B → C + D. it represents two initial substrates are required to produce each of two products.