DNA Double Helix modeled in Blender.

Mostly quads subdivisional geometry.

All modifiers are left in stack and the path that deforms the dna strand is also adjustable, so this DNA strand can be animated and tweaked fully.

The blender file is render-ready and set up using adaptive subdivision for efficiency. The displacement map was created using nodes in Blender. This can be easily rendered with GPU because of efficient workflow.

This is a very flexible model and can be fully used to create commercial level animations.

All objects are logically named in Outliner and everything is ready to go.

This was created and tested in Blender 2.79. I have used Principled BSDF shader for this.

Word about the FBX file:
Only the bare geometry is included, but the file has UV maps. There are no displacement maps or textures included, so the FBX file cannot be rendered as it is to resemble the preview renders in this product. I recommend to use Blender or create your own displacement maps for it. The FBX file has frozen subdivisional geometry, but can be further subdivided. (about 200k points)