Recently completed a cover for researchers submitting to Nature magazine. To make the cover means two things: the content and the art are of a caliber that best represents Nature.
What's going on? The quick skinny is this little green hormone seated inside the blue protein creates a glue when the magenta protein interfaces with the blue protein. My image shows the 'reaction' of the adhesion.
The imagery is 3D in molecular source, crystallography. Composited and composed in Photoshop and Painter.

http://www.nature.com/nature/journal/v446/n7136/index.html