"Brain" (https://sketchfab.com/3d-models/brain-735ca31a3b22433281e6fa9606792faa) by maheshshinde777 (https://sketchfab.com/maheshshinde777), licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/).
Changes: geometry re-compressed (meshopt) and textures converted to WebP with glTF-Transform (npx -y @gltf-transform/cli@4.5.1 optimize in.glb brain.glb --compress meshopt --texture-compress webp); re-lit and tinted at render time.
Obtained via the Objaverse mirror (allenai/objaverse on Hugging Face, glbs/000-078/735ca31a3b22433281e6fa9606792faa.glb, sha256 518ac0153d2449f4393d82cf77967afe84c2b56ebcb11e5c12d7b3b7d5578f80; dataset licence ODC-By 1.0).