dna double helix 3d model

3D scientific molecular scene showing nucleotide excision repair in action. A DNA double helix is partially unwound in the center, forming a bubble-shaped open loop around a large dark bulky adduct lesion wedged between two bases. Two large protein complexes flank the open bubble on either side, one shown as a teal globular protein with a helicase ring shape on the left, and one as a purple scissors-like endonuclease on the right positioned to make incision cuts at the 5 prime and 3 prime ends of the lesion. A short single-stranded DNA segment is being excised and pulled away from the bubble. Clean scientific visualization style, soft studio lighting, transparent background, photorealistic molecular surfaces, no text.