---
id: "kegg_orthology_id"
kind: "datatype"
status: "draft"
is_pii: false
categories: ["science"]
langs: ["common"]
quality: 85
url: "http://registry.apicrafter.io/datatype/kegg_orthology_id"
---

# KEGG Orthology (KO) identifier (`kegg_orthology_id`)

> **Draft.** Draft records have not been reviewed yet and may be incomplete or wrong; do not treat them as authoritative for legal or compliance decisions.

Identifier of a KEGG Orthology group: a manually defined group of orthologous genes that matches a node in KEGG pathway maps and BRITE hierarchies, used to assign functions to genes. It is K and a number.

- Personal data (PII): no
- Categories: Scientific (science)
- Countries: global
- Languages: Common to most languages (common)
- Classification: identifier

## Detection

Regular expression (Python `re`):

```
^K\d+$
```

## Examples

- `K00001` — ADH, alcohol dehydrogenase; Bioregistry example
- `K00844` — HK, hexokinase
- `k00001` (invalid example) — Lowercase k

## Mappings

- bioregistry: `kegg.orthology`

## Sources

- doc: <https://www.genome.jp/kegg/ko.html>
- other: <https://bioregistry.io/registry/kegg.orthology>

## Quality

Score 85/100. Missing: translation, detector coverage.

JSON: <http://registry.apicrafter.io/api/v1/datatypes/kegg_orthology_id.json> · Edit: <https://github.com/apicrafter/metacrafter-registry/edit/main/data/datatypes/any/science/kegg_orthology_id.yaml>