# BRENDA Tissue and Enzyme Source Ontology (BTO)

> A structured controlled vocabulary for the source of an enzyme. It comprises terms for tissues,...

- Page: https://library.schematica.io/model/189f98de902b448bb5b7c9f4fe4ef22e
- Model type: Ontology
- License: CC BY 4.0
- Access type: Free
- Access method: Download
- Model size: Mid
- Formats: OBO
- Domains: Healthcare
- Audiences: Researcher
- External link: https://bioportal.bioontology.org/ontologies/BTO
- Contact: BrendaTissue Administrators (antje.jaede@online.de)
- Listed in library: 2025-06-12
- Last updated: 2025-09-10

## Description

## Ontology Info

| Field | Value |
|-------|-------|
| Acronyme | 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. |
| Format | OBO |
| Categories |  |
| Groups | OBO Foundry |

## Metrics

| Metric | Value |
|--------|-------|
| Classes | 6,569 |
| Individuals | 0 |
| Properties | 10 |
| Max Depth | 7 |
| Max Child Count | 290 |
| Average Child Count | 4 |
| Classes With One Child | 329 |
| Classes With More Than 25 Children | 19 |
| Classes With No Definition | 1,055 |

## Projects using BTO

- [ISA software suite](https://bioportal.bioontology.org/projects/ISS)
- [Beta Cell Genomics database](https://bioportal.bioontology.org/projects/BCGD)

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Source: https://library.schematica.io/model/189f98de902b448bb5b7c9f4fe4ef22e