The HRA 3D Reference Object Library provides anatomically correct reference organs. The organs are developed by a specialist in 3D medical illustration and approved by organ experts.

The Human Reference Atlas (HRA) effort aims to map the human body at single cell resolution. The HRA 3D Reference Object Library collection provides anatomically based reference organs developed by medical illustrators and approved by organ experts. The HRA Portal documents standard terminologies, data structures, and tools that use the 3D Reference Objects to support tissue registration via the Registration User Interface and HRA exploration via the Exploration User Interface and the HRA Organ Gallery in Virtual Reality .