Prototype KG‑aware adaptation of the BioPortal interface. Graph pages generated from live KG‑Registry metadata; tool links go to the live BioPortal.
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OBA

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Ontology of Biological Attributes

KGXBioPortal ontologyv2026-07-14CC0 1.0
Visibility: Public

A KGX transformation of the BioPortal ontology Ontology of Biological Attributes (OBA), produced by KG‑Bioportal. Nodes are ontology classes; edges are the relations between them.

Graph at a glance

103,888
Nodes
283,029
Edges
2026-07-14
Version
2026-09-14
Transformed

Products & downloads

KGX
KGX nodes & edges
OBA.tar.gz
104K nodes · 283K edges
Base graph is the full graph

This ontology declares no imports, so its base graph already is its full graph; nothing separate was built.

The graph contains OBA_nodes.tsv and OBA_edges.tsv. Releases are incremental, so each link points at whichever release most recently rebuilt this ontology.

Biolink categories 21 categories across 103,888 nodes

Attribute25,890
Polypeptide25,382
NamedThing21,173
BiologicalProcessOrActivity11,202
AnatomicalEntity7,050
PhenotypicFeature4,881
MolecularEntity2,920
Disease2,283
Cell1,797
CellularComponent429
OrganismTaxon277
ChemicalEntity233
MacromolecularComplex178
PhysicalEntity65
NucleicAcidEntity41
InformationContentEntity31
Activity29
LifeStage19
MaterialSample4
Gene2
Publication2

An item carrying more than one category is counted under each, so these counts can add up to more than the total.

How they were assigned 82,715 of 103,888 nodes (79.6%)

25is a seed term whose Biolink class is not in doubt
82,690inherits from a seed term above it in the hierarchy

Biolink categories 1 category across 283,029 edges

Association283,029

An item carrying more than one category is counted under each, so these counts can add up to more than the total.