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. Author manuscript; available in PMC: 2022 Dec 12.
Published in final edited form as: Curr Opin Microbiol. 2021 Aug 5;63:172–178. doi: 10.1016/j.mib.2021.07.008

Figure 2.

Figure 2

Category A and B substrates. Category A substrates, shown in cyan, are the substrates entering glycolysis either at the upper part (e.g., D-glucose, D-glucose-6-phosphate, D-gluconate, D-mannitol, D-fructose, D-sorbitol, D-mannose, lactose, melibiose, L-arabinose, and D-xylose) or in the middle part (e.g., glycerol and L-fucose). Category B substrates, shown in pink, include pyruvate and TCA substrates such as succinate, fumarate, malate, and oxaloacetate. As a rule, hierarchical utilization is observed only among substrates of category A.