**DNA methylation**
Blender import of pdb file 329D from Protein Data Bank.
See relevant picture in Wikipedia, John Baez [post]( https://plus.google.com/117663015413546257905/posts/b7t7iRSdYcm) and [YouTube video](http://youtu.be/_r-pOUZcIEc). See also [model](https://skfb.ly/FnQo) with Hydrogen atoms and rotated [model](https://skfb.ly/G8tD) without water molecules.