While the MIBiG data standard accepts information about tailoring enzymes/maturases, its scope is limited. In the data standard employed by MIBiG version 3.0, the term "tailoring" is a free text field, lacking ontologies and parameters to specify the exact reaction, its site of metabolism within the metabolite structure, or details on substrate specificity. Other, more specialized databases for representing enzymatic reactions exist , but they also come with limitations with regard to storing tailoring natural-product-associated enzyme/maturase reactions and substrate specificities.