# Human Reference Atlas (HRA)

> The Human Reference Atlas (HRA) is a comprehensive, high-resolution, three-dimensional atlas of...

- Page: https://library.schematica.io/model/7b7e5e043f8144b3a80e8707dbb1d263
- Model type: Ontology
- License: CC BY 4.0
- Access type: Free
- Access method: Download
- Model size: Huge
- Formats: OWL
- Domains: Healthcare
- External link: https://bioportal.bioontology.org/ontologies/HRA
- Contact: Katy Börner (katy@iu.edu)
- Listed in library: 2025-06-12
- Last updated: 2025-09-10

## Description

## Ontology Info

| Field | Value |
|-------|-------|
| Acronyme | HRA |
| Description | The Human Reference Atlas (HRA) is a comprehensive, high-resolution, three-dimensional atlas of all the cells in the healthy human body. The Human Reference Atlas provides standard terminologies and data structures for describing specimens, biological structures, and spatial positions linked to existing ontologies. |
| Format | OWL |
| Categories | Biomedical Resources, Human |
| Groups |  |

## Metrics

| Metric | Value |
|--------|-------|
| Classes | 11,682 |
| Individuals | 158,299 |
| Properties | 13 |
| Max Depth | 23 |
| Max Child Count | 1,674 |
| Average Child Count | 5 |
| Classes With One Child | 968 |
| Classes With More Than 25 Children | 40 |
| Classes With No Definition | 6,875 |

## Projects using HRA

No projects using HRA

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Source: https://library.schematica.io/model/7b7e5e043f8144b3a80e8707dbb1d263