HIV-1 reverse transcriptase caught in the act of copying, with template-primer DNA and an incoming nucleotide. The enzyme converts the viral RNA genome into DNA.

Scientifically accurate model built directly from the experimental atomic coordinates of Protein Data Bank entry 1RTD (X-ray crystallography, 3.20 angstrom resolution), biological assembly 1. Source organism: Human immunodeficiency virus 1. 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, 4 distinct components)
- Bound ligands, cofactors and metal ions as separate ball-and-stick objects (MG x4, TTP; PDB component codes)
- 93,020 polygons, 94,034 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 1RTD; Huang et al., Science, 1998. PDB structure data are in the public domain (CC0 1.0).