Copper-zinc superoxide dismutase, the antioxidant enzyme that neutralises superoxide radicals. Mutations in the human enzyme cause a form of ALS.

Scientifically accurate model built directly from the experimental atomic coordinates of Protein Data Bank entry 2SOD (X-ray crystallography, 2.00 angstrom resolution), biological assembly 1. Source organism: Bos taurus. Only atoms that were resolved in the experiment are represented; nothing has been added or invented.

MODEL
- Molecular surface of every chain as a separate, named object (2 chains, 1 distinct component)
- Bound ligands, cofactors and metal ions as separate ball-and-stick objects (CU x2, ZN x2; PDB component codes)
- 84,296 polygons, 84,306 vertices; all quads
- All surface meshes closed and manifold (no holes)
- One Principled BSDF material per component; no textures needed
- 1 unit = 1 nanometer; centred at the origin; objects grouped under one parent

FORMATS
- Blender 4.0 (.blend), native, with studio lighting and camera (Cycles)
- FBX (.fbx)
- OBJ (.obj + .mtl)
- glTF 2.0 binary (.glb)
- USD (.usdc)
- STL (.stl), geometry only

Structure reference: PDB 2SOD; Tainer et al., J.Mol.Biol., 1982. PDB structure data are in the public domain (CC0 1.0).