hierarchicalDescendants: Get hierarchical descendants

API: ac.uk:embl-ebi-ontology-lookup-service-ols-api
Endpoint: /ontologies/{ontologyId}/terms/{termId}/hierarchicalDescendants
Response format: application/json
Auth: none
Method: GET
Last Status: 200
Latency: 2142ms

Description

Returns all hierarchical descendants of the specified term (is_a relations only)

Parameters (5)

lang (string, query, optional, default: en)

Language code

ontologyId (string, path, required)

Ontology ID (e.g., 'go', 'efo', 'mondo')

page (integer, query, optional, default: 0)

Page number (0-indexed)

size (integer, query, optional, default: 20)

Page size

termId (string, path, required)

Term IRI (URL-encoded, typically double-encoded)

Examples (1)

Get hierarchical descendants of independent continuant probe-gate 
curl 'https://www.ebi.ac.uk/ols4/api/ontologies/go/terms/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FBFO_0000004/hierarchicalDescendants'
import requests

resp = requests.get("https://www.ebi.ac.uk/ols4/api/ontologies/go/terms/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FBFO_0000004/hierarchicalDescendants")
data = resp.json()
import zingu_apis

api = zingu_apis.api("embl-ebi-ontology-lookup-service-ols")
result = api.fetch("ontologies/{ontologyId}/terms/{termId}/hierarchicalDescendants")

for item in result:
    print(item)
const resp = await fetch("https://www.ebi.ac.uk/ols4/api/ontologies/go/terms/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FBFO_0000004/hierarchicalDescendants");
const data = await resp.json();

Probe History

Latency

Status Codes

TimeStatusLatencySize
2026-04-16 01:28:54.852309 200 2142ms 2.0MB
2026-04-15 02:09:44.785319 200 2139ms 2.0MB
2026-04-14 00:51:24.186819 200 15431ms 2.0MB
2026-04-12 14:28:17.477287 200 11487ms 2.0MB
2026-04-10 04:12:08.704404 200 12158ms 2.0MB
2026-04-09 03:07:50.669024 200 12450ms 2.0MB
2026-04-08 00:28:32.654874 200 13158ms 2.0MB
2026-04-07 00:48:58.125780 200 2630ms 2.0MB
2026-04-06 00:32:47.670883 200 8841ms 2.0MB