Influenza N1 neuraminidase tetramer with the antiviral drug oseltamivir in its active sites. Neuraminidase releases new virus particles from infected cells.

Scientifically accurate model built directly from the experimental atomic coordinates of Protein Data Bank entry 2HU4 (X-ray crystallography, 2.50 angstrom resolution), biological assembly 1. Source organism: Influenza A virus. 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 (4 chains, 1 distinct component)
- Bound ligands, cofactors and metal ions as separate ball-and-stick objects (G39 x4; PDB component codes)
- 99,428 polygons, 101,516 vertices; all quads
- Every surface mesh is closed and manifold (no holes, no loose or overlapping vertices)
- One material per component (Principled BSDF); colours are easy to change. No textures needed
- Scale: 1 unit = 1 nanometer. Model centred at the origin, transforms clean, objects grouped under one parent

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

Preview images were rendered in Blender Cycles. The wireframe image shows the actual mesh.

Structure reference: PDB 2HU4; Russell et al., Nature, 2006 (doi:10.1038/nature05114). PDB structure data are in the public domain (CC0 1.0).