BioCyc is a genome and metabolic pathway web portal covering more than 5,500 organisms. It enables visualization of metabolomics data on individual pathway diagrams and on the organism-specific metabolic map diagrams that are available for every BioCyc organism. In addition, it has online tools for browsing metabolic/regulatory networks, gene, metabolites within the networks, examine the connectivity of the network, and other functionalities. Especially useful in the bioinformatics.