Metabolic Encyclopedia for Pathway/Genome Databases

MetaCyc is a database of non-redundant, experimentally elucidated metabolic pathways and enzymes. It also contains reactions, chemical compounds, and genes. It stores predominantly qualitative information rather than quantitative data, although it does contain some quantitative data such as enzyme kinetics data. MetaCyc is [curated](http://www.biocyc.org/glossary.shtml?sid=biocyc14-3908554027#Curation) from the scientific experimental literature according to an [extensive process](https://metacyc.org/MetaCycUserGuide.shtml#TAG:__tex2page_sec_4)]. The majority of pathways occurring in it are from microorganisms and plants. MetaCyc stores thousands of additional enzyme-catalyzed reactions that have not yet been assigned an EC number