QuickGO (EBI GO Annotation Browser)

Base URL

https://www.ebi.ac.uk/QuickGO/services/

Auth

No auth required.

Key Endpoints

Endpoint	Description
`/ontology/go/terms/{goId}`	GO term details
`/ontology/go/terms/{goId}/children`	Child terms
`/ontology/go/terms/{goId}/ancestors`	Ancestor terms
`/ontology/go/search?query={term}`	Search GO terms by keyword
`/annotation/search`	Search annotations by gene/taxon/GO term

Annotation Search Parameters

goId — GO term (e.g. GO:0003723)
taxonId — NCBI taxonomy (e.g. 9606 for human)
geneProductId — UniProt accession
evidence — evidence code (e.g. ECO:0000269)
aspect — biological_process, molecular_function, cellular_component
limit, page — pagination

Example Calls

# GO term details
https://www.ebi.ac.uk/QuickGO/services/ontology/go/terms/GO:0003723

# Human annotations for RNA binding
https://www.ebi.ac.uk/QuickGO/services/annotation/search?goId=GO:0003723&taxonId=9606&limit=10

# Search terms by keyword
https://www.ebi.ac.uk/QuickGO/services/ontology/go/search?query=apoptosis&limit=5

Response Format

JSON. Annotations: paginated results with gene product, GO term, evidence, qualifier.

Rate Limits

EBI fair-use policy. Use download endpoint for large result sets.