Comparison of constructed 'Cyc' metabolic pathways among cattle, human and E. coli. Numbers of metabolic pathways, shared by CattleCyc 1.0, HumanCyc 11.0 and EcoCyc 11.0. The numbers in parentheses are the total number of pathways in the corresponding databases. (A) Consensus pathways at the enzyme level (all enzymes in the pathway have the same EC numbers). (B) Consensus pathways at the functional level (pathways that share biological function even though individual enzymes may differ and alternative reactions may exist).