| Acronym | BTO |
| Description | A structured controlled vocabulary for the source of an enzyme. It comprises terms for tissues, cell lines, cell types and cell cultures from uni- and multicellular organisms. |
| External Link | http://bioportal.bioontology.org/ontologies/BTO |
| Citation | Chang, A et al. (2015) BRENDA in 2015: exciting developments in its 25th year of existence. Nucleic Acids Res. 43:D439-46. |
