is a Ontology.
It is part of the OBO Foundry collection.
Cell types that are provisionally defined by experimental techniques such as single cell or single nucleus transcriptomics rather than a straightforward & coherent set of properties.
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| ID | Name | URL | Category | Format | Description |
|---|---|---|---|---|---|
| pcl.owl | pcl.owl | pcl.owl (159.8 MB) | OntologyProduct | owl | Provisional Cell Ontology in OWL format |
| pcl.obo | pcl.obo | pcl.obo (38.0 MB) | OntologyProduct | obo | Provisional Cell Ontology in OBO format |
| ID | Name | URL | Category | Format | Relation | Description |
|---|---|---|---|---|---|---|
| hra-kg.graph.ttl | HRA KG graph data, v2.2, Turtle format | graph.ttl (194.6 MB) | GraphProduct | ttl | had primary source | The graph representation of the Human... |
| hra-kg.graph.json | HRA KG graph data, v2.2, JSON-LD format | graph.json (17.6 KB) | GraphProduct | jsonld | had primary source | The graph representation of the Human... |
| hra-kg.graph.xml | HRA KG graph data, v2.2, RDF/XML format | graph.xml (176.5 MB) | GraphProduct | rdfxml | had primary source | The graph representation of the Human... |
| hra-kg.graph.nt | HRA KG graph data, v2.2, N-Triples format | graph.nt (277.9 MB) | GraphProduct | ntriples | had primary source | The graph representation of the Human... |
| hra-kg.graph.nq | HRA KG graph data, v2.2, N-Quads format | graph.nq (359.5 MB) | GraphProduct | nquads | had primary source | The graph representation of the Human... |
The Provisional Cell Ontology (PCL) captures cell type definitions that are still primarily grounded in experimental signatures, especially single-cell and single-nucleus transcriptomics, rather than a stable set of classical defining properties. PCL terms are intended to complement the Cell Ontology while those definitions mature, and may later migrate into CL when they become conventionally defined.
PCL is maintained by the OBO Foundry and developed in the obophenotype/provisional_cell_ontology
repository using an ODK-based workflow. The repository README identifies the issue
tracker as the preferred channel for new term requests and corrections, while the OBO
Foundry entry and OLS provide the main public discovery surfaces.
Created: September 29, 2025 | Last modified: June 18, 2026