Body models derived from Z-Anatomy (https://www.z-anatomy.com, github.com/Z-Anatomy/Models-of-human-anatomy),
licensed CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/). Z-Anatomy builds on BodyParts3D
(c) The Database Center for Life Science, CC BY-SA 2.1 JP. Changes: decimated, recoloured, Draco-compressed;
skin.glb is a smoothed shell generated from the muscle and bone meshes. These model files are shared under the same license.

Heart, vessel and lung models in several lessons are from the Human Reference Atlas (HRA) 3D Reference Objects
(HuBMAP, https://humanatlas.io), based on the Visible Human Project, licensed CC BY 4.0
(https://creativecommons.org/licenses/by/4.0/). Changes: decimated, recoloured, Draco-compressed.

Close-ups of cells, molecules, the uterus and fetus, nephron and tissue layers are drawn in code for teaching and are illustrative.